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Science 9 Maaasahan_Reviewer

Total questions: 186

Worksheet time: 9hrs 18mins

Name
Class
Date
1.
Which is true from Newton's Third law of motion?
a)
For every action force there is a smaller reaction force in the opposite direction.
b)
For every action force there is an equivalent reaction force in the opposite direction.
c)
 Both 1 and 2
d)
None of the above
2.
What is Newtons 2nd law?
a)
equal&opposite force
b)
law inertia
c)
f=ma
3.

When forces on an object are balanced, what is the net force?

a)

0

b)

5

c)

10

d)

21

4.

______________ measures an object's tendency to resist changing its motion.

a)

Acceleration

b)

Inertia

c)

Gravity

d)

Weight

5.

The formula ...

? = mass x acceleration


Is used to find which of the following:

a)

Force

b)

Velocity

c)

Momentum

d)

Gravity

6.

The formula ...

? = Distance / Time


is used to find which of the following?

a)

Velocity

b)

Force

c)

Momentum

d)

Speed

7.
It takes more force to accelerate the iron man on the left than the iron man on the right because the iron man on the left has more mass. This best describes
a)
Newton's first law, the law of inertia
b)
Newton's second law, the law of acceleration
c)
Newton's third law, the law of action reaction 
d)
The law of universal gravitation
8.
What is the net force?
a)
400 N Up
b)
400 N Down
c)
- 400 N Down
d)
800 N Down
9.
A _____ is a pull or a push.
a)
force
b)
friction
c)
gravity
d)
speed
10.

_____________ is a change in speed, a change in direction, or both.

a)

Acceleration

b)

Velocity

c)

Time

11.

An object is in motion relative to the _________________________.

a)

Mass

b)

Reference Point

c)

Gravity

d)

Forces and Motion

12.

Isaac Newton created the three laws of ______________.

a)

motion

b)

movement

c)

gravity

d)

texting

13.

According to Newton, what kinds of objects are affected by gravity?

a)

Only objects inside the earth's atmosphere, like apples.

b)

Only objects that orbit the sun, like planets.

c)

Only objects with a lot of mass, like human beings.

d)

All objects in the universe.

14.

Which force would cause an object to fall?

a)

friction

b)

net force

c)

gravitational force

d)

centripetal force

15.

When you are on a ride that goes in a circle, you feel pushed or pulled in a circular motion. It happens because of __________________.

a)

centripetal force

b)

centrifugal force

c)

tension force

d)

friction

16.

This game of tug of war is an example of _________ forces.

a)

unbalanced

b)

balanced

c)

potential

d)

net zero

17.

A contact force is from

a)

objects physically touching

b)

far apart objects

c)

not touching object

d)

always a pull

18.

What effect does friction have on a moving object?

a)

it causes the moving object to slow and eventually stop

b)

it causes the moving object to speed up

c)

it keeps the moving object moving in the same direction forever

d)

it causes the moving object to turn around and move in the opposite direction

19.

Person on the left = 45 N

Person on the right = 32 N

What is the net force?

a)

zero N

b)

10 N

c)

77 N

d)

13 N

20.

This motion graph represents:

a)

constant speed

b)

acceleration

c)

body at rest

d)

slowing down

21.

An object at rest stay at rest and an object in motion stays in motion until acted upon by an unbalanced force.

a)

Newton's 3rd Law

b)

Force

c)

Newton's 2nd Law

d)

Newton's 1st Law

22.

Equal forces that do not cause a change in an objects motion

a)

Unbalance force

b)

Push or a pull

c)

Balanced force

d)

Average speed

23.

A basketball that is thrown to the ring follows a path that is ______________.

a)

hyperbolic

b)

parabolic

c)

linear

d)

circular

24.

What happens to the horizontal velocity of a projectile as it travels along the curved path?

a)

increases

b)

decreases

c)

stays the same

d)

none of these

25.

What happens to the vertical velocity of a projectile as it goes up?

a)

increases

b)

decreases

c)

stays the same

d)

none of these

26.

What happens to the vertical velocity of a projectile as it goes down?

a)

increases

b)

decreases

c)

stays the same

d)

none of these

27.

What is the vertical acceleration of a projectile due to gravity?

a)

-9.0 m/s

b)

-9.8 m/s

c)

-9.8 m/s2

d)

-9.08 m/s2

28.

What do you call the horizontal distance travelled by a projectile?

a)

path

b)

trajectory

c)

range

d)

parabola

29.

What force acts in the y direction that causes an object to follow a parabolic path?

a)

tension

b)

friction

c)

gravity

d)

no force

30.

What is the meaning of PROJECTILE MOTION?

a)

A. A projectile motion can be a basketball, a soccer ball, a stone, an arrow, a human cannonball at a circus, a frog hopping, or even a long jumper at the Olympic game.

b)

B. Projectile motion is the motion of an object thrown or projected into the air, subject to only the acceleration of gravity.

c)

C.Projectile motion is the curved path of the object in respect to its motion along with the gravity.

d)

D. The projectile motion can be expressed as x components and y components.

31.

What is point of projection?

a)

A. The parabolic path followed by a projectile.

b)

B. The projectile from which an object is projected in air is called as velocity of projection.

c)

C. The point from which the object is projected in air.

d)

D. All of the above

32.

Definition of Trajectory.

a)

A. It is the horizontal distance travelled by the projectile during entire motion.

b)

B. Trajectory is the projectile to cover the entire trajectory.

c)

C. The parabolic path followed by a projectile in air.

d)

D. All of the above

33.

Find the meaning for velocity of projection.

a)

A. The velocity angle with the horizontal at which an object is projected in air.

b)

B. It is the maximum vertical distance travelled by the projectile from the ground level during its motion.

c)

C. An object which is projected in the air.

d)

D. The velocity with which an object is projected in air.

34.

What is angle protection?

a)

A. Taken by the projectile angle to cover the entire trajectory.

b)

B. The parabolic path followed by a projectile in air.

c)

C. The point from which the object is projected in air

d)

D. The angle with the horizontal at which an object is projected in air.

35.

Definition for time of flight.

a)

A. Taken by the projectile to cover the entire trajectory.

b)

B. It is the horizontal distance travelled by the projectile during entire motion.

c)

C. It is the maximum vertical distance travelled by the projectile from the ground level during its motion.

d)

D. It is the horizontal distance travelled by the projectile during entire motion.

36.

Which do you think is the BEST that describes for MAXIMUM HEIGHT OF PROJECTILE?

a)

A. It is the maximum distance travelled by the projectile during entire motion.

b)

B. The maximum with which an object is projected in air.

c)

C. It is a motion in which an object is thrown near the earth’s surface, and it moves along the curved path under the action of gravity only.

d)

D. It is the maximum vertical distance travelled by the projectile from the ground level during its motion.

37.

Which does not describe a projeectile motion?

a)
b)
c)
d)
38.

A horizontally-launched projectile arcs out and hits the ground below. The vertical displacement and the horizontal displacement are measured. What is the best equation to use to find the time the projectile was in the air?

a)

d→x=v→x⋅t\overrightarrow{d}_x=\overrightarrow{v}_x\cdot t

b)

d→y=+12⋅g⋅t2+v→yi⋅t\overrightarrow{d}_y=+\frac{1}{2}\cdot g\cdot t^2+\overrightarrow{v}_{yi}\cdot t

c)

v→yf=v→yi+g⋅t\overrightarrow{v}_{yf}=\overrightarrow{v}_{yi}+g\cdot t

d)

t=2⋅d→ygt=\sqrt{\frac{2\cdot\overrightarrow{d}_y}{g}}

39.

A skateboarder rolls off a bridge into the river as shown. If the skateboarder was originally moving at 7.0 m/s, how much time did the skateboarder spend in the air?

a)

1.3 s

b)

0.79 s

c)

38.5 s

d)

0.70 s

e)

Not enough information given.

40.

A skateboarder rolls off a bridge into the river as shown. If the skateboarder spent 0.79 s in the air, how far above the river is the edge of the bridge?

a)

5.5 m

b)

0.70 m

c)

1.3 m

d)

3.1 m

e)

Not enough information given.

41.

In the picture, cannonball A was launched at 10 m/s at 60°, and B was launched at 18 m/s at 25°. The cannonball that hit the ground first was

a)

A, because it had less total velocity.

b)

B, because it had more total velocity.

c)

A, because it had less initial vertical velocity.

d)

B, because it had less initial vertical velocity.

42.

A projectile is launched with a horizontal velocity of 20 m/s and an initial vertical velocity of 20 m/s. Which graph correctly shows the horizontal position of the projectile over time?

a)
b)
c)
d)
43.

A projectile is launched with a horizontal velocity of 20 m/s and an initial vertical velocity of 20 m/s. Which graph correctly shows the vertical position of the projectile over time?

a)
b)
c)
d)
44.

A projectile is launched, and its vertical and horizontal velocities are shown in the graph. What is the magnitude of the projectile's initial velocity?

a)

25 m/s

b)

10 m/s

c)

325 m/s

d)

18 m/s

45.

When an object is in projectile motion, which of the following remains constant throughout its flight?

a)

Horizontal velocity

b)

Acceleration

c)

Horizontal displacement

d)

Kinetic energy

46.

What angle of projection will result in the maximum range for a projectile launched from the same initial velocity?

a)

0 degrees

b)

45 degrees

c)

90 degrees

d)

It depends on the initial velocity.

47.

Which of the following is true for the horizontal component of velocity in projectile motion?

a)

It increases with time.

b)

It remains constant.

c)

It decreases with time.

d)

It varies unpredictably.

48.

If you double the initial velocity of a projectile, how does it affect the time of flight, neglecting air resistance?

a)

The time of flight doubles.

b)

The time of flight is halved.

c)

The time of flight remains the same.

d)

The time of flight quadruples.

49.

In the absence of air resistance, which path does a projectile follow?

a)

A straight line

b)

A parabolic path

c)

A circular path

d)

An elliptical path

50.

If two projectiles are launched at the same angle but with different initial velocities, which one will have a longer range, assuming no air resistance?

a)

The one with the higher initial velocity.

b)

The one with the lower initial velocity.

c)

Both will have the same range.

d)

It depends on the angle of projection.

51.

In a vacuum (no air resistance), how does the horizontal velocity of a projectile change over time?

a)

It decreases.

b)

It increases.

c)

It remains constant.

d)

It fluctuates.

52.

Which component of a projectile's motion is affected by gravity?

a)

Horizontal motion

b)

Vertical motion

c)

Both horizontal and vertical motions

d)

Neither horizontal nor vertical motions

53.

What is the relationship between the angle of projection and the maximum height reached by a projectile?

a)

Maximum height is independent of the angle of projection.

b)

Maximum height increases with a larger angle of projection.

c)

Maximum height decreases with a larger angle of projection.

d)

Maximum height is directly proportional to the initial velocity.

54.
Softer landings tend to
a)
increase impact force
b)
increase force
c)
increase collision time
d)
increase change in momentum
55.
A runner has a momentum of 670 kg m/s and is travelling at a velocity of 9 m/s. What is his mass?
a)
6030 kg
b)
0.0134 kg
c)
74.4 kg
d)
80 kg
56.
The purpose of crumble zones on a car is to
a)
decrease time of impact.
b)
increase force of impact.
c)
increase the time of impact.
d)
decrease the impulse during impact.
57.

In an isolated system, the net ____ on that system is zero.

a)

external force

b)

internal force

c)

time interval

d)

displacement

58.
A biker with a mass of 75 kg moves along the path with a constant velocity of 5 m/s. What is the biker's momentum?
a)
25 m/s
b)
375 m/s
c)
25 kg m/s
d)
375 kg m/s
59.
In a physics experiment, two carts of mass 1.5 kg each are rolled towards each other.  The orange cart has a velocity of 2 m/s and the blue cart has a velocity of -1m/s.  The carts stick together when they collide.  Calculate their final speed.
a)
0.5 m/s
b)
1.0 m/s
c)
0.33 m/s
d)
0.67 m/s
60.

The momentum of an object depends upon the object's ___________&_____________.

a)

size and shape

b)

mass and speed

c)

mass and veloctiy

d)

mass and energy

61.
The total momentum before a collision is _________ the total momentum after a collision.
a)
equal to 
b)
less than 
c)
more than
d)
It depends on the type of collision
62.
If two objects have the same mass, then the faster moving object has ____________ momentum.
a)
more 
b)
less
c)
the same
63.

The units for Impulse are

a)

kg

b)

N⋅sN\cdot s

c)

N

d)

m/s

e)

kg⋅mskg\cdot\frac{m}{s}

64.
How can a tennis ball and a bowling ball have the same momentum?
a)
have the same speed
b)
have different speeds
c)
one is moving backwards
d)
they can't
65.

Check ALL that apply.

Impulse is:

a)

The force that creates an acceleration.

b)

The change in momentum.

c)

the change in velocity that can be caused by a constant force over some discrete amount of time.

d)

A vector

e)

NOT a vector

66.

For an object that hits a wall and bounces back, the Δp is:

a)

positive

b)

negative

c)

neutral

67.

When a cannon fires a cannon ball, it recoils backwards. This occurs because of...

a)

Energy in the system is conserved

b)

Energy in the system is increased

c)

Momentum in the system is conserved

d)

Energy in the system is not conserved

68.

An egg landing on a soft surface will remain intact. The surface increases the _____ and decreases the _____ during the impact

a)

impulse, time

b)

impulse, force

c)

force, time

d)

time, force

69.

A 10 kg object moves at 2 m/s to the right and collides with a 4 kg object moving at 5 m/s to the left. The total momentum is_____

a)

20 kg*m/s

b)

40 kg*m/s

c)

10 kg*m/s

d)

30 kg*m/s

e)

0 kg*m/s

70.
When the speed of an object is doubled, its momentum __________.
a)
remains unchanged 
b)
doubles
c)
quadruples
d)
decreases
71.

This gif is an example of...

a)

An Inelastic collision

b)

An Elastic collsion

72.
The equation to calculate momentum is
a)
p=mv
b)
p=1/2mv2
c)
p=mgh
d)
p=mg
73.
Which has more momentum: a car stopped at a red light or a bike moving at 15 mph?
a)
car
b)
bike
c)
they are equal
d)
cannot determine using the info provided
74.
In any collision (crash) the ______ is ALWAYS constant
a)
Total Momentum
b)
total speed
c)
total Velocity
d)
Energy
75.
A 0.250 kg cart moving at 0.400 m/s has how much momentum?
a)
0.1 kg-m/s
b)
1 kg-m/s
c)
10 kg-m/s
d)
100 kg-m/s
76.
A boy kicks a football with a force of 20 N, the time the force acts for is 0.3 s.
Calculate the impulse on the ball.
a)
1 N*s
b)
6 N*s
c)
33.3 N*s 
d)
None of these
77.

If the change of momentum of an object is 50kg m/s, we can say the impulse is equal to:

a)

0 N*s

b)

25 N*s

c)

50 N*s

d)

100 N*s

78.
When the speed of an object is doubled, its momentum
a)
remains unchanged in accord with the conservation of momentum.
b)
doubles
c)
quadruples
d)
decreases
79.

An object having a pi of 30kg m/s has ended with a pf of 40 kg m/s. What impulse caused this?

a)

2 N*s

b)

10 N*s

c)

70 N*s

d)

5 N*s

80.

No collision is either perfectly elastic or perfectly inelastic.

a)

True

b)

False

81.
Jorge noticed a collision outside the coffee shop where two cars collided and stuck together.  What type of collision did he observe?
a)
Elastic
b)
Inelastic
c)
Completely inelastic
d)
none
82.
While playing pool, Emma notices that the pool balls bounce apart.  What type of collision is this?
a)
Elastic
b)
Inelastic
c)
Explosive
d)
Force
83.
Determine the momentum of 1000-kg car moving southward at 20 m/s......... 
a)
20000 N
b)
20000 Joules
c)
20000 Kg * m/s south
d)
10000 kg * m/s south
84.
A 50 kg ball rolls down the street at 5 m/s. Calculate the momentum of the ball. 
a)
55 kg*m/s
b)
100 kg*m/s
c)
250 kg*m/s
d)
500 kg*m/s
85.

Which of the following statements describes momentum?

a)

the product of body’s mass and velocity

b)

the product of body’s mass and acceleration

c)

the sum of body’s mass and velocity

d)

the sum of body’s mass and acceleration

86.

What type of quantity are momentum and velocity?

a)

director

b)

reactor

c)

scalar

d)

vector

87.

What is the unit for momentum?

a)

kgm/s

b)

kgm/s2

c)

Nkg

d)

Nm/s

88.

What word can best describe the total momentum in an isolated system?

a)

constant

b)

large

c)

lost

d)

low

89.

Calculate the momentum of a car, which has a mass of 1000 kg and moves with a velocity of 20 m/s.

a)

500 kgm/s

b)

10, 020 kgm/s

c)

20000 kgm/s

d)

99 980 kg m/s

90.

The total momentum of two objects before collision is 450 kgm/s. What will be their total momentum after collision?

a)

0 kgm/s

b)

175 kgm/s

c)

350 kgm/s

d)

450 kgm/s

91.

Two objects with a total mass of 20 kg has an initial momentum of 100 kg∙m/s. If the masses stick together after the collision, what is the final velocity of the masses?

a)

1 m/s

b)

5 m/s

c)

50 m/s

d)

100 m/s

92.

Two billiard balls with mass 1.0 kg each are travelling towards each other. The first one is moving at a velocity of 3 m/s, while the other one moves at a velocity of -2m/s. After the collision, one billiard ball moves to the left at a speed of 2 m/s. What is the speed of the other ball?

a)

-3 m/s

b)

-2 m/s

c)

2 m/s

d)

3 m/s

93.

A 2.0-kg chunk of putty moving at 5.0 m/s collides with and sticks to a 8.0-kg bowling ball that is initially at rest. The bowling ball with its putty passenger will then be set in motion with what speed?

a)

1 m/s

b)

2 m/s

c)

3 m/s

d)

4 m/s

94.

A 125 kg car moving at 12 m/s hits a 200 kg car moving at -13m/s. If the first car bounces back at -12.5 m/s what is the velocity of the second car after the collision?

a)

1.2 m/s

b)

2.3 m/s

c)

3.2 m/s

d)

4.1 m/s

95.

Which car applied the LARGER FORCE onto the other one?

a)

RED CAR

b)

SILVER CAR

c)

BOTH APPLIED EQUAL FORCES

d)

NO FORCE WAS GENERATED

96.

Which of NEWTON'S LAWS OF MOTION would explain the forces applied to each car?

a)

1st

b)

2nd

c)

3rd

97.

ACTION: Tennis racket applies a force onto the ball.

REACTION: ???

a)

Ball flies away.

b)

Racket is broken.

c)

The ball and racket stop moving.

d)

The ball applies an equal and opposite force onto the racket.

98.

Which experiences a larger force? ΔP = Ft\Delta P\ =\ Ft

a)

Happy

b)

Sad

c)

Forces are EQUAL

99.

Which ball has a SHORTER TIME OF CONTACT with the surface? ΔP = Ft\Delta P\ =\ Ft

a)

Happy

b)

Sad

c)

Time of contact is EQUAL

100.

What type of collision would pool balls hitting and bouncing apart be?

a)

Elastic

b)

Inelastic

101.

The LAW OF CONSERVATION of MOMENTUM states that:

momentum before (P before) ___ momentum after (P after) the collision.

a)

is GREATER THAN

>

b)

is LESS THAN

<

c)

Is EQUAL TO

=

102.

If a 5 Kg bowling ball rolling at 2 mps were to collide with another 5 Kg ball that was at rest, what would the NEW MOMENTUM be for the SECOND BALL if the first ball STOPPED?

a)

0 Kg x mps

b)

10 kg x mps

c)

3 kg x mps

d)

2.5 kg x mps

103.

What TYPE of COLLISION would occur between a bug and a car's windshield?

a)

elastic

b)

inelastic

104.

A 1kg bird flying at -10mps collides with a 1000 Kg car traveling at 30 mps. STICKING TOGETHER after the collision, the car/bird combo;

a)

speeds up

b)

slows down slightly

c)

doesn't change speed

d)

stops

105.

What will happen when these two balls INELASTICALLY COLLIDE with each other?

a)

They will move left (toward blue ball)

b)

They will move right (toward red ball)

c)

They will bounce off and go opposite directions.

d)

They will stick together and stop.

106.

The Law of Conservation of Momentum states:

a)

The total momentum before a collision is equal to the total momentum after a collision.

b)

The total momentum before a collision is greater than the total momentum after a collision.

c)

The total momentum before a collision is less than the total momentum after a collision.

d)

The total momentum before a collision is not related to the total momentum after a collision.

107.

If two objects collide or explode, they experience

a)

the same impulse causing the same change in momentum.

b)

different impulses causing the same change in momentum.

c)

different impulses causing different changes in momentum.

d)

the same impulse causing different changes in momentum.

108.

An object is speeding up when: (Choose All That Apply) (May have to choose more than 1 to be right)

a)

it is gaining kinetic energy.

b)

it is losing kinetic energy.

c)

it is gaining gravitational potential energy.

d)

it is losing gravitational potential energy.

109.

The sum of the kinetic and potential energy in a system is known as the system's _____________________ energy.

a)

mechanical

b)

chemical

c)

thermal

d)

combined

110.

This drawing illustrates which of the following?

a)

Conservation of Mechanical Energy

b)

Conservation of Mass

c)

Conservation of Momentum

d)

Conservation of Matter

111.

At which point in the picture must the cart have been moving the fastest?

a)

Point 1

b)

Point 2

c)

Point 3

d)

They would all be the same

112.

At which point in the picture must the cart have the most MECHANICAL energy?

a)

Point 1

b)

Point 2

c)

Point 3

d)

They would all be the same

113.
At which point(s) on the roller coaster is the gravitational potential energy at its maximum?
a)
A
b)
B
c)
C
d)
D
114.
At which point(s) on the roller coaster is the kinetic energy at its maximum?
a)
A
b)
B
c)
C
d)
D
115.
What is mechanical energy?
a)
It is what metal creates when heated.
b)
All potential and kinetic energy in a system.
c)
It is motion of all matter.
d)
Energy of momentum.
116.
When my velocity triples, my kinetic energy increases by ______ times.
a)
9
b)
 3 
c)
1.5
d)
4.5
117.
What does the Law of Conservation of Energy state?
a)
Energy cannot be created or destroyed
b)
Nothing can exchange energy
c)
Energy will increase over time.
d)
Energy will decrease over time.
118.

An object is speeding up when: (Choose All That Apply) (May have to choose more than 1 to be right)

a)

it is gaining kinetic energy.

b)

it is losing kinetic energy.

c)

it is gaining gravitational potential energy.

d)

it is losing gravitational potential energy.

119.

How much kinetic energy (K) does a baseball with a mass of 0.143 kg have if it is travelling at a velocity of 41.1 m/s?

HINT: K = 1/2mv2

a)

120.8 joules

b)

89.7 joules

c)

108.3 joules

d)

156.6 joules

120.

If a ball tossed into the air has a maximum gravitational potential energy of 5.75 joules, what is its maximum kinetic energy in the same toss?

a)

5.75 joules

b)

11.14 joules

c)

2.88 joules

d)

7.93 joules

121.

A 1.0 kg ball is stationary at the top of a hill that is 10.0 meters in height. The ball rolls all the way down the hill. What is its gravitational potential energy at the bottom of the hill?

a)

0 joules

b)

98 joules

c)

49 joules

d)

38 joules

122.

What is the MECHANICAL energy of the roller coaster car?

a)

100 joules

b)

50 joules

c)

2500 joules

d)

1 joule

123.

What was the Potential energy of the car at very top of the hill if the car had 0 J of Kinetic energy?

a)

100 joules

b)

50 joules

c)

2500 joules

d)

1 joule

124.

What was the Kinetic energy of the car at near the bottom of the hill if the car still had 10 J of Potential energy?

a)

10 joules

b)

50 joules

c)

90 joules

d)

500 joule

125.

If a ball has a height of 10m and a mass of 0.5 kg, what will be it's KE after it has fallen halfway to a height of 5m?

(HINT: Find PE first. )

g = 9.8 m/s2

a)

5.10 J

b)

2.55 J

c)

10.2 J

d)

12.5 J

126.

If a 0.5 kg ball is thrown up with 250 J of kinetic energy, how high will it go?

(HINT: At the ball's highest point it has stopped.) KE = 1/2mv2

g = 9.8 m/s2

a)

51 m

b)

25.5 m

c)

12.76 m

d)

31.6 m

127.

A cliff diver with a mass of 125 kg jumps off a 50m high cliff, how fast will he be traveling just before he hits the water? (His height at this point is 0m)

(HINT: Find PE first.) KE = 1/2mv2

g = 9.8 m/s2

a)

61,250 m/s

b)

980 m/s

c)

31.3 m/s

d)

247.5 m/s

128.

A cliff diver with a mass of 125 kg jumps off a high cliff, at a height of 10m he is moving at 15.5 m/s. What is his MECHANICAL energy.

(HINT: ME = KE + PE)

g = 9.8 m/s2

a)

15,015.6 J

b)

12,250 J

c)

27,265.6

d)

2,765.6

129.

The Law of Conservation of Energy states:

a)

Energy can created or destroyed but not transformed

b)

Energy cannot be created or destroyed, it can only transformed

c)

Energy can't be created, destroyed or transformed

d)

Energy cannot be created or destroyed.

130.

The Law of Conservation of Energy states:

a)

Energy can created or destroyed but not transformed

b)

Energy cannot be created or destroyed, it can only transformed

c)

Energy can't be created, destroyed or transformed

d)

Energy cannot be created or destroyed.

131.

What kind of energy does an object possess when it's resting on top of the hill?

a)

Potential Energy

b)

Chemical Energy

c)

Kinetic Energy

d)

All of the above

132.

A kettle uses 100J of electrical energy to produce 7J of sound energy and 93J of thermal energy. How efficient is the kettle?

a)

100%

b)

7%

c)

93%

d)

95%

133.

A washing machine uses 250J of electrical energy to produce 125J of useful energy. How efficient is it?

a)

5%

b)

50%

c)

55%

d)

100%

134.
What type of device might this Sankey be about?
a)
A very efficient LED light bulb
b)
A very inefficient incandescent light bulb
c)
A coal power plant
d)
A wind turbine
135.
No machine in existence has 100% efficiency due to ____________________.
a)
magic
b)
friction
c)
smoke
d)
input
136.

Total energy = 200J
Useful energy = 20J

Workout the efficiency of this lightbulb.
efficiency = useful enegytotal energy in ×100efficiency\ =\ \frac{useful\ enegy}{total\ energy\ in}\ \times100  

a)

100%

b)

80%

c)

40%

d)

10%

137.

To save energy, what should you do when you leave a room ?

a)

USE ELECTRICAL ENERGY

b)

SHUT OFF THE LIGHTS AND TELEVISION

c)

TURN ON THE LIGHTS AND TELEVISION

d)

HANG YOUR CLOTHES OUTSIDE

138.

How can you dry your clothes to save energy?

a)

Use the dryer machine

b)

Don't dry your clothes

c)

Leave the fridge door open

d)

Hang the clothes to dry outside on a line

139.
To increase the EFFICIENCY of energy use, we could...
a)
Turn off lights when not in use
b)
Keep the car running as you go into the store
c)
Water the plants in a drought
140.
Another way to save energy is to...
a)
Conserve it
b)
Waste it
c)
Use it
141.
What is energy conservation?
a)
Adding up all your energy use
b)
Reducing energy use
142.
No machine in existence has 100% efficiency due to ____________________.
a)
magic
b)
friction
c)
smoke
d)
input
143.
What is the efficiency of a machine if 55.3 J of work are done on the machine, but only 14.3 J or work are done by the machine?
a)
0.25 Joules
b)
26%
c)
3.86 Joules
d)
386%
144.

Total energy = 200J
Useful energy = 20J

Workout the efficiency of this lightbulb.
efficiency = useful enegytotal energy in ×100efficiency\ =\ \frac{useful\ enegy}{total\ energy\ in}\ \times100  

a)

100%

b)

80%

c)

40%

d)

10%

145.

Total energy = 350J
Useful energy = 70J

Workout the efficiency of this iphoneX.
efficiency = useful energytotal energy in ×100%efficiency\ =\ \frac{useful\ energy}{total\ energy\ in}\ \times100\%  

a)

100%

b)

80%

c)

40%

d)

20%

146.

Total energy = 34000J
Useful energy = 340J

Workout the efficiency of this vintage VW Beetle.
efficiency = useful energytotal energy in ×100%efficiency\ =\ \frac{useful\ energy}{total\ energy\ in}\ \times100\%  

a)

100%

b)

10%

c)

40%

d)

20%

147.

This car needs 8600J of energy to power it. If 5000J is changed into useful energy, how much energy is wasted?

a)

13600J

b)

3600J

c)

5000J

d)

8600J

148.

A car transfers 100 J of chemical energy in order to gain 50 J of kinetic energy. The efficiency of the car is

a)

20%

b)

0.5%

c)

50%

d)

200%

149.

Which of these equations is correct?

a)

efficiency = useful energy transferredtotal energy transferredefficiency\ =\ \frac{useful\ energy\ transferred}{total\ energy\ transferred}  

b)

efficiency = total energy transferreduseful energy transferredefficiency\ =\ \frac{total\ energy\ transferred}{useful\ energy\ transferred}  

c)

energy = efficiency ×100%energy\ =\ efficiency\ \times100\%  

d)

efficiency = wasted energy transferredtotal energy tranferredefficiency\ =\ \frac{wasted\ energy\ transferred}{total\ energy\ tranferred}  

150.
What is the efficiency of a machine if 55.3 J of work are done on the machine, but only 14.3 J is produced by the 1machine?
a)
0.25 J
b)
26%
c)
386%
d)
3.86 J
151.
What is the efficiency of the machine if the input is 263 J and the output is 142 J? 
a)
6.26%
b)
54%
c)
100%
d)
260%
152.
What is the efficiency of a machine that has work input of 40 joules and work output of 35 joules?
a)
87.50%
b)
1200
c)
1.142
d)
114%
153.
What is the work output of a machine that has a work input of 2,800 Joules and an efficiency of 92.3%? 
a)
2,690J
b)
92.3J
c)
0.0082J
d)
2,584.4
154.

What is the useful work output of a machine that consumes 2,800 Joules and an efficiency of 40%?

a)

7000 J

b)

2760 J

c)

1120 J

155.
Lucas has been challenged to increase the efficiency of a device he is redesigning. His goal is 90% efficiency. The work input of the device is fixed at 10 joules, so Lucas is trying to improve work output. How many joules of work output should Lucas aim for to attain his goal of 90% efficiency?
a)
9 Joules
b)
900 Joules
c)
0.9 Joules
d)
25 
156.

What percent energy is wasted by a machine if the energy input is 262 J and the energy output is 131 J?

a)

5%

b)

50%

c)

100 J

157.

What is the work output of a machine that has a work input of 2,800 Joules and an efficiency of 90%?

a)

25200 J

b)

2520 J

c)

0.0082J

158.

It is a paddle wheel in an engine that transforms rotational motion into mechanical energy.

a)

generator

b)

PV cells

c)

turbine

d)

wind blade

159.

identify the power plant

a)

geothermal

b)

hydroelectric

c)

tidal

d)

nuclear

160.

identify the power plant

a)

fossil fuel

b)

solar

c)

geothermal

d)

hydroelectric

161.

What spins the turbine in this power plant?

a)

flowing water

b)

hot water

c)

steam

d)

oil

162.

What type of transformer is shown?

a)

step-down

b)

step-up

163.

Which type of transformer is used in mobile charger?

a)

step-down

b)

step-up

164.

Which doesn't use a turbine generator?

a)

1

b)

2

c)

3

d)

4

165.

Which requires steam to generate electricity?

a)

1

b)

2

c)

1 and 2

d)

1 and 3

e)

1, 2, and 3

166.

It is connected to the consumer’s circuit and measures the amount of energy consumed in every household

a)

pole transformer

b)

electric meter

c)

circuit breaker

d)

distribution feedeers

167.

Which power plants uses fossil fuels to produce electricity?

a)

Panay Diesel Power Plant

b)

Burgos Wind Farm

c)

Montelago Geothermal Power plant

d)

Calatagan Solar Power plant

168.

Which power plant uses water to produce electricity?

a)

Sabangan Hydro Electric Power Plant

b)

Montelago Geothermal Power plant

c)

Burgos wind farm

d)

Calatagan Solar Power plant

169.

How is Electricity Generated?

a)

By the use of turbines

b)

by the use of electricity

c)

by the use of sub stations

d)

by the use of transmission lines

170.

How does Electricity transmitted?

a)

via transmission lines

b)

via substations

c)

via distribution lines

d)

via water flow

171.

How is Electricity distributed?

a)

via transmission line

b)

by the use of powerplant

c)

via distribution line

d)

by the use of turbines

172.

Which of the following is utilize to generate electricity in a hydro electric power plant?

a)

Nuclear

b)

Water

c)

coal

d)

Fossil Fuel

173.

How is electricity distributed to our houses?

a)

Through the use of power plants

b)

via transmission lines

c)

through the use of turbines

d)

via distribution lines

174.

What are the steps in the electrical power system?

a)

Generation, transmission and distribution.

b)

generation, transmission and transformer

c)

generation, impedance and distribution.

d)

Motor, transmission and distribution.

175.

How do Solar power plant produce electricity?

a)

the sunlight turns the turbines

b)

the solar panels collect the lights coming from the sun.

c)

the steam from the sunlight rotates the turbines

d)

it doesn't happen at all.

176.

How does the powerplant produce electricity?

a)

the thunder hit the transmission line and it produce electricity

b)

the water flows to turn the turbines and generate electricity

c)

the substation generate the electricity

d)

none of the above

177.

A branch of physics that deals with the physical laws that relate heat and mechanical work.

a)

Thermodynamics

b)

Classical Physics

c)

Kinematics

d)

Dynamics

178.

Energy caused by temperature difference

a)

Temperature

b)

Heat

c)

Work

d)

Efficiency

179.

The energy transferred when an object is moved against force.

a)

Thermodynamics

b)

Heat

c)

Work

d)

Force

180.

A comparison of the energy output to the energy input in a given system.

a)

Machine

b)

Effective

c)

Heat

d)

Efficiency

181.

This is the the limited, defined part of the universe

a)

System

b)

Surrounding

c)

Universe

d)

Boundary

182.

The observable, physical world

a)

System

b)

Surroundings

c)

Universe

d)

Boundary

183.

All parts of the universe not included in the defined system.

a)

System

b)

Boundary

c)

Surroundings

d)

Universe

184.

TRUE or FALSE: If two bodies are each in thermal equilibrium with a third body, they are also in equilibrium with each other.

a)

TRUE

b)

FALSE

185.

TRUE or FALSE: Energy is created and destroyed and is transformed into different forms.

a)

TRUE

b)

FALSE

186.

What is that temperature when molecules have no movement (no kinetic energy) and it is when entropy reaches or approaches a constant value?

(a)  

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