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8th Grade Ch. 6 Review

Total questions: 95

Worksheet time: 3hrs 10mins

Name
Class
Date
1.

When a student runs and kicks a ball, they have applied an ___________ force to move the ball.

a)

Balanced

b)

Magnetic

c)

Spring

d)

Unbalanced

2.

When the teacher rearranges the desks in the classroom, she must apply ____________ to push and pull the desks around.

a)

acceleration

b)

force

c)

weight

d)

magnets

3.

Which law of motion says that you must push or pull objects harder if they have more mass?

a)

1st

b)

2nd

c)

3rd

d)

4th

4.

Walking down the hall and speeding up when you turn and go down the stairs is an example of ____________.

a)

acceleration

b)

weight

c)

gravity

d)

friction

5.

Letting go of a balloon full of air is demonstrating Newton's ______ _______ ________ _________ because the air comes out of the back and the balloon moves forward.

a)

1st law of motion

b)

2nd law of motion

c)

3rd law of motion

d)

13th law of motion

6.

What law is best described by inertia?

a)

1st

b)

2nd

c)

3rd

d)

law of conservation of mass

7.

A person not paying attention while skateboarding hits a rock. The skateboard stops...they don't.

a)

The Law of Inertia (1st law)

b)

The Law of Acceleration (2nd law)

c)

The Law of Conservation of Momentum

d)

Action Reaction Law (3rd law)

8.

What Unit do we Measure Force in?

a)

Newtons

b)

Joules

c)

Force

d)

Kilograms

9.

What is Newton's First Law

a)

F=ma

b)

Every action has an equal and opposite reaction

c)

An object at rest stays at rest, an object in motion stays in motion.

d)

Friction

10.

A 20 kg bike accelerates at 10 m/s2. what was the force

F = m x a

a)

25 Newtons

b)

20 Newtons

c)

200 Newtons

d)

10 Newtons

11.

Newton's third law states that any action will have a(n) _______ and ______ reaction

a)

Equal and similar

b)

Equal and opposite

c)

Equal and different

d)

Greater and opposite

12.

8 N to the left , and 4 N to the right. Find the net force. Is this balanced

a)

12 N Right No

b)

4 N Left No

c)

12 N Right Yes

d)

4 N Left Yes

13.

What is this graph representing?

a)

Constant Speed

b)

Acceleration (speeding up)

c)

Deceleration (slowing down)

d)

No motion

14.

Who proposed that electrons move around the nucleus in circular orbits?

a)

Dalton

b)

Thomson

c)

Rutherford

d)

Bohr

15.

Which is NOT a physical change?

a)

Cutting a pizza into equal slices.

b)

Ice cubes melting back into liquid. water

c)

Baking cupcakes.

d)

A chocolate bar melting.

16.

What type of force is this man using to push his grocery cart?

a)

Normal Force

b)

Gravity

c)

Air Resistance

d)

Applied Force

17.

What is the net force?

a)

3 N

b)

3 N, right

c)

17 N, right

d)

3 N, left

18.
Who wins the tug of war with what net force?
a)
The person on the left with 20 N
b)
The person on the left with 80 N
c)
The people on the right with 20 N
d)
The people on the right with 100 N
19.
What is the net force?
a)
20 N 
b)
0 N 
c)
400 N 
d)
40 N 
20.

What is the unit to MEASURE force?

a)

Kilogram

b)

Meter

c)

Pounds

d)

Newton

21.

A ____________ is a push or a pull on an object.

a)

friction

b)

force

c)

magnet

d)

gravity

22.
If these teams are pulling with the same amount of force what will happen?
a)
The boy in blue will win.
b)
They will not move at all.
c)
The boy in red will win.
d)
Both will fall down.
23.
Balanced or unbalanced?
a)
balanced
b)
unbalanced
24.

Forces that have a net force of zero Newtons

a)

Balanced force

b)

Unbalanced force

25.
The sum of all forces acting on an object.
a)
Contact Force
b)
Balanced Force
c)
Unbalanced Force
d)
Net Force
26.
What will cause an object to move?
a)
Applied forces
b)
Balanced forces
c)
Unbalanced forces
27.
Calculate the Net Force. 
a)
60N, Left 
b)
40N, Right 
c)
0N
d)
60N, Right
28.
What is a Force?
a)
The distance
b)
Mass
c)
A push or pull
d)
Give me a  failing grade 
29.
What force holds the planets in motion around the sun?
a)
Magnetic
b)
Electrical
c)
Gravitational
d)
Air Resistance
30.
What does the strength of gravity between two objects depend upon?
a)
Mass & distance
b)
Mass & weight
c)
Gravity & inertia
d)
Inertia & mass
31.
All objects in the universe have a gravitational attraction to each other. 
a)
True
b)
False
32.
Jupiter has about 317 times more mass than Earth. What can you infer from this fact? 
a)
That Jupiter’s gravitational force is much weaker than on Earth’s gravitational force.
b)
That Jupiter’s gravitational force is much stronger than Earth’s gravitational force.
c)
That Jupiter’s and Earth’s gravitational forces are equal.
d)
Mass has no effect on the gravitational force between two objects
33.
This type of force resist motion between two surfaces that are pressed together
a)
contact
b)
gravity
c)
friction
34.

If both forces are going in the same direction you should______ those forces

a)

Add

b)

Subtract

c)

Divide

d)

Multiply

35.

When forces are going in the opposite direction of each other you should do what do find the net force

a)

Subtract

b)

Add

c)

Divide

d)

Multiply

36.
How does friction affect speed?
a)
more friction decreases speed
b)
more friction increases speed
c)
less friction decreases speed
d)
less friction doesn't affect speed
37.
Friction is a force that acts in an ___________ direction of movement.
a)
similar
b)
opposite
c)
parallel
d)
west
38.
Which of the following is an example of friction that is helpful?
a)
Brakes used on a bike
b)
Tires from a car on the road
c)
Tread on the bottom of your shoes
d)
All are examples that are helpful
39.
Which of the following is an example of friction that is harmful?
a)
Pencil marking on paper
b)
Engine parts wearing out
c)
sand placed on ice in the winter
d)
Using an eraser to erase marks
40.
Which would NOT be a way of reducing friction?
a)
making the surfaces smoother
b)
using lubricants such as waxes, oils, or grease
c)
changing from sliding friction to rolling friction using ball bearings
d)
Using kitty litter on snow and ice to help your car gain traction
41.
What does friction produce?
a)
light
b)
sound
c)
heat
d)
gravity
42.
 What is the unit called that measures force?
a)
weight
b)
meter
c)
Newton
d)
kilogram
43.
Friction is a force that acts in an ___________ direction of movement.
a)
similar
b)
opposite
c)
parallel
d)
west
44.
Rougher surfaces have ...
a)
greater friction
b)
less friction
c)
the same level of friction
45.
How do you lower the friction force?
a)
By a smooth surface
b)
By a rough surface
c)
By not pushing hard
d)
By pushing down
46.
What is the bowling alley lane coated with to reduce friction?
a)
oil
b)
wood
c)
paint
d)
sand
47.
What part of a car increases friction?
a)
color of paint
b)
tires
c)
amount of gas
d)
skill of driver
48.

The direction of force of friction is always _____ to the direction of motion

a)

same

b)

opposite

c)

unchanged

d)

none of these

49.

Without friction, an object in motion would never stop.

a)

true

b)

false

50.

Which of these materials do you predict would have the MOST amount of friction?

a)

metal

b)

tile

c)

sand paper

d)

denim

51.

The rouugher the surface, the faster an object will travel over the surface

a)

true

b)

false

52.

How would the absence of friction affect a marble travelling on a long, straight path?

a)

the marble's speed would decrease

b)

the marble would remain at a constant speed

c)

the marble's speed would increase

d)

the marble would stop immediately

53.

When we rub our hands together _________.

a)

frictional force works between them

b)

energy is released

c)

our hands become warm

d)

all off the above

54.

The state that exists when the only force acting on an object is gravity is called

a)

free fall

b)

inertia

c)

acceleration

d)

momentum

55.

The acceleration due to gravity near the surface of Earth is equal to

a)

9.8 m/s

b)

9.8 kg x m/s

c)

9.8 N

d)

9.8 m/s2

56.

Satellites in orbit around the Earth travel in almost circular path because Earth is

a)

centripetal

b)

free falling

c)

curved

d)

massive

57.

The word centripetal means

a)

center seeking

b)

gravitational

c)

continuous

d)

free falling

58.

The force that causes an object to move in a circle is called centripetal force?

a)

True

b)

False

59.

Any object that travels around another object in space is a satellite.

a)

True

b)

False

60.

An object traveling in a circle is accelerating because it is constantly changing

a)

speed

b)

velocity

c)

direction

d)

force

61.

______________ is the centripetal force that causes a satellite to move in a circle.

a)

String

b)

Space Shuttle

c)

Gravity

d)

Helicopter

62.

Satellites in orbit around Earth continually fall toward _______.

a)

Moon

b)

my house

c)

Earth

d)

the sun.

63.

If you could turn off a centripetal force, ___________ would cause the object to fly off in a straight line.

a)

inertia

b)

momentum

c)

Earth

d)

force

64.
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
65.
Determine the momentum of 1000-kg car moving northward at 20 m/s......... 
a)
20000 N
b)
20000 Joules
c)
20000 Kg * m/s
d)
20000 kg * m/s north
66.
The definition of momentum is
a)
Mass in Motion
b)
The size of an object
c)
The velocity of an object
d)
A comparison between two objects
67.
The equation to calculate momentum is
a)
p=mv
b)
p=1/2mv2
c)
p=mgh
d)
p=mg
68.
In any collision (crash) the ______ is ALWAYS constant
a)
Total Momentum
b)
total speed
c)
total Velocity
d)
Energy
69.
What is Newton's Third Law?
a)
Object in motion stays in motion and an object at rest stays at rest unless acted on by a outside force
b)
Force = mass x acceleration
c)
For every action there is an equal and opposite reaction
70.
A 9 kg blob moving at 5 m/s collides and sticks to a second blob with a mass of 5 kg. If the two bobs stick together, what will the velocity of the two blobs move at?
a)
3.57 m/s
b)
3.2 m/s
c)
10.0  m/s
d)
9.0  m/s
71.
A 9300 kg railroad car traveling at a velocity of 5 m/s strikes a second boxcar that weighs 5000 kg at rest. At what speed will the second boxcar move?
a)
18.6 m/s
b)
9.3 m/s
c)
7.5 m/s
d)
1.86 m/s
72.
A runner has a momentum of 720 kg m/s and is traveling at a velocity of 5 m/s. What is his mass?
a)
14.4 kg
b)
1400 kg
c)
144 kg
d)
360 kg
73.
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
74.
Two football players with mass 75 kg and 100 kg run directly toward each other with speeds of 6 m/s and 8 m/s respectively. If they grab each other as they collide, the combined speed of the two players just after the collision would be:
a)
2 m/s 
b)
3.4 m/s 
c)
4.6 m/s 
d)
7.1 m/s
75.
An open cart on a level surface is rolling without frictional loss through a vertical downpour of rain. As the cart rolls, an appreciable amount of rainwater accumulates in the cart. The speed of the cart will
a)
increase because of conservation of mechanical energy
b)
decrease because of conservation of momentum
c)
decrease because of conservation of mechanical energy
d)
remain the same because the raindrops are falling perpendicular to the direction of the cart's motion
76.
What is the SI unit used to measure force? 
a)
pounds 
b)
grams 
c)
newtons 
d)
friction
77.
Gravity attracts all objects towards one another.
a)
False
b)
True
c)
It depends
78.
Any object with mass has gravity.
a)
True
b)
Sometimes
c)
False
d)
Never
79.
As distance between two objects increase the pull of gravity 
a)
Increases
b)
Decreases
c)
Stays the same
80.
The force of gravity acting on an object is the object's ______.
a)
mass
b)
matter
c)
weight 
d)
friction 
81.
The amount of matter in an object is 
a)
pressure
b)
weight
c)
mass
d)
force
82.
Which of the following never changes no matter where in the universe?
a)
weight
b)
force
c)
mass
d)
pounds
83.
A person would weigh less on on the Moon than on the Earth because . . .
a)
Moon has more mass, and therefore more gravity
b)
Moon has less mass, and therefore more gravity
c)
Moon has more mass, and therefore less gravity
d)
Moon has less mass and therefore less gravity
84.
Two factors effecting the magnitude of the force of gravity between 2 objects are...
a)
mass and distance 
b)
mass and matter
c)
distance and weight 
d)
weight and mass
85.
Gravity attracts all objects towards one another.
a)
False
b)
True
c)
It depends
86.
If Earth's mass was cut in half, what would happen to your mass?
a)
increase because gravitational force increases
b)
decrease because gravitational force decreases
c)
decrease because gravitational force increases
d)
nothing, mass is not affected by gravitational force
87.
Every object in the universe attracts every other object.
a)
True
b)
False
88.
If Earth's mass was cut in half, what would happen to your weight?
a)
Increase because gravitational force increases
b)
decrease because gravitational force decreases
c)
decrease because gravitational force increases
d)
nothing, weight is not affected by gravitational force
89.
Without gravity we would________. 
a)
Float away
b)
Stay in the ground
c)
Nothing would happen.
d)
I don't know
90.
Where can you jump higher, on Earth or on the Moon?
a)
Earth
b)
Moon
91.
Where would you have more mass, on Earth or on the Moon?
a)
Earth
b)
Moon
c)
IS THE SAME, mass DOESN'T CHANGE
d)
In both Planets.
92.
Are astronauts in space and close to Earth being pulled by it?
a)
Yes, that's why they float (but they're actually falling)
b)
No, they don't feel Earth's gravity.
93.
A person would weigh more on Jupiter than on the Earth because---
a)
Jupiter has less mass, and therefore less gravity
b)
Jupiter has more mass, and therefore less gravity.
c)
Jupiter has less mass, and therefore more gravity.
d)
Jupiter has more mass, and therefore more gravity
94.
If a person weights 100 pounds on Earth, calculate how much that person would weight on Jupiter. (Jupiter has 3 times the amount of gravity than Earth does)
a)
100 pounds 
b)
300 pounds 
c)
33.3 pounds 
d)
Not enough information is given
95.
Gravity on Mar's surface is much lower than it is here on Earth. This is because the mass is __________than Earth.
a)
less
b)
more
c)
the same 

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