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FINAL - 2nd Semester - Conceptual Physics

Total questions: 60

Worksheet time: 1hrs 26mins

Name
Class
Date
1.
The correct SI units for mass would be:
a)
slugs
b)
newtons
c)
force
d)
kilograms
2.
What is inertia?
a)
The resistance an object has to change its state of motion.
b)
The amount of net force on an object.
c)
The total amount energy an object will have.
d)
The amount of motion
3.
Momentum is
a)
the same as energy
b)
a relationship between mass and velocity
c)
work required to move an object at rest
d)
work required to keep an object moving
4.

What is the momentum of a person with a mass of 200 kg that is running at 2 m/s?


p = mv

a)

400 kg x m/s

b)

0.05 kg x m/s

c)

100 kg x m/s

d)

500 kg x m/s

5.
Car A is 2,000 kg and has a speed of 5 m/s. Car B is 2,000 kg and has a speed of 10 m/s. Car B has:
a)
Half as much momentum as Car A
b)
The same momentum as Car A
c)
Twice as much momentum as Car A
d)
1/4 the amount of momentum as Car A
6.
Which type of collision will have object bouncing off of each other?
a)
Elastic
b)
Inelastic
c)
Pop Apart
7.
Impulse is defined as
a)
the change in momentum
b)
time required for an object to stop
c)
amount of force an object feels
d)
a quick force
8.
Conservation of Momentum states
a)
Momentuminitial=Momentumfinal
b)
Momentumintial>Momentumfinal
c)
Momentuminitial<Momentumfinal
9.
Energy 
a)
cannot be created nor destroyed
b)
can be created and destroyed
c)
is never conserved
d)
irrecoverable after use
10.
All energy is measured in
a)
Newtons
b)
Joule
c)
m/s2
d)
Watts
11.
Type of energy associated with springs or rubber bands
a)
Gravitational Potential Energy
b)
Kinetic Energy
c)
Elastic Potential Energy
d)
Energy conservation
12.
A sack of groceries with a mas of 22 kg is lifted off the floor with a velocity of 6 m/s.  What is the kinetic energy of the sack of groceries?
a)
396 Joule
b)
66 Joule
c)
660 Joule
d)
39.6 Joule
13.
Which would have the greater gravitational potential energy when raised to 5 m?
a)
2 kg
b)
1 kg
c)
both the same
d)
not able to determine
14.
A 95kg diver and a 40kg diver both standing on top of a 10 meter platform have the same amount of gravitational energy.
a)
True
b)
False
15.
At which point does the object have the greatest kinetic energy?
a)
Point A
b)
Point B
c)
Point C
d)
Point D
16.

A 2.2 kg kitten jumps down from a 4.0 meter high fence. What is the kitten's potential energy in Joules? (gravity = 10 m/s/s)

a)

88 Joule

b)

880 Joule

c)

5.5 Joule

d)

0 Joule

17.
Energy can be best described as:
a)
The ability to do work
b)
Gravity
c)
Inertia
d)
Quantity of Motion
18.
Which of the following objects has potential energy?
a)
A bicycle coasting down hill
b)
ball rolling across the floor
c)
bowling ball knocking over a pin
d)
glass sitting on a table
19.
Work is:
a)
Force divided by distance
b)
Distance divided by time
c)
Force multiplied by distance
d)
Distance multiplied by time
20.

The unit of work is

a)

watt

b)

hertz

c)

joule

d)

pascal

21.

A major league pitcher can throw a baseball with a kinetic energy of 150 J. How much work must the pitcher do to the ball to give it that much KE?

a)

150 J

b)

0

c)

Can’t tell without knowing the mass of the ball

22.

What is the unit for power?

a)

what

b)

watt

c)

joule

d)

Jewel-Osco

23.

How much work is done on a 200-kg crate that is hoisted 2 m in a time of 4 s?

a)

400 J

b)

1000 J

c)

1600 J

d)

4000 J

24.

How much power is required to raise a 200-kg crate a vertical distance of 2 m in a time of 4 s?

a)

400 W

b)

1000 W

c)

1600 W

d)

4000 W

25.

If a charging elephant has kinetic energy, it must also have

a)

potential energy

b)

momentum

c)

work

d)

all of these

26.

The greater the mass of an object, the greater the force due to gravity.

a)

True

b)

False

27.
An object will weigh more on
a)
Mars
b)
Earth
c)
Jupiter
d)
the moon
28.
Gravity is best described as the attractive force 
a)
that does not exist in space
b)
that acts between any two objects
c)
that acts between magnets and iron
d)
that does not affect orbiting satellites
29.
If a feather and a hammer fall to the ground from the same height in a vacuum,
a)
the feather would land first
b)
the hammer would land first
c)
they would land at the same time
d)
they would both float
30.

A boy with a weight of 637 Newtons can sprint at 10 m/s. What is his kinetic energy?

a)

2000 J

b)

3380 J

c)

3250 J

d)

3380 Newtons

31.

Power is defined as ___?

a)

p= w/t

b)

p= a/t

c)

p= t/v

d)

p= a x f

32.

How much power is required to do 40 J of work on an object in 5 s?

a)

8W

b)

35W

c)

45W

d)

200W

33.

A very massive object of 100 kg and a less massive object of 1 kg are 1 m apart. What is the value of the force of attraction?


Fg = G (m1*m2)/r2.

a)

6.67 x 10-10 N*m2/kg2

b)

6.67 x 10-11 N*m2/kg2

c)

.1 x 10-10 N*m2/kg2

d)

1000 N*m2/kg2

34.
Calculate the PE of a 2 kg cat perched 10 meters above the ground. 
a)
20 J
b)
200 J
c)
2.04 J
d)
200 W
35.
Calculate the Kinetic Energy (KE) of a girl whose mass is 50 kg who is moving at 4 m/s.
a)
200 J
b)
800 J
c)
400 J
d)
100 J
36.
The equation to calculate momentum is
a)
p=mv
b)
p=1/2mv2
c)
p=mgh
d)
p=mg
37.
A 2.5 kg ball moving at 5 m/s collides with a 2.5 kg stationary ball in a perfectly elastic collision.  What is the velocity of the second ball after the collision? 
a)
5 m/s
b)
2.5 m/s
c)
10 m/s
d)
7.5 m/s
38.
can a bullet have the same momentum a truck?
a)
yes
b)
no
39.

Juan observed a collision in a lab where the kinetic energy after the collision was equal to the kinetic energy before the collision. This type of collision is

a)

Inelastic

b)

Elastic

c)

Explosion

40.

What is a machine?

a)

Anything that can make a force bigger

b)

Anything that can make a force smaller

c)

A complicated gadget

d)

Something only scientists build

41.

Extra credit:

What is one famous scientist that we learned about and what were their contributions? (Worth 5 points)

4 lines
42.

Calculate the gravitational force of attraction between a 1,819-kg car and a 10,200-kg truck, separated by a distance of 0.25 m.


Fg = G (m1*m2)/r2. G = 6.67 x 10-11 N*m2/kg2.

a)

2 x 10-2 N

b)

6.4 x 10-3 N

c)

2 x 102 N

d)

9 x 10-5 N

e)

5 x 10-4 N

43.

Einstein explained gravity as the idea that large masses can ____.

a)

create black holes

b)

warp the space around them

c)

create comets

d)

pull apart gravity

44.

What keeps the planets orbiting around the Sun?

a)

inertia

b)

the heat from the Sun

c)

the weightless environment

d)

gravity

45.

The force of gravity between two objects depends on _____.

a)

the masses of the objects only

b)

the masses of the objects and their distance from one another

c)

the masses of the objects and the acceleration of the two objects

d)

the masses of the objects and the speeds they are traveling

46.
This simple machine allowed Elijah to lift a heavy rock.
a)
wedge
b)
lever
c)
screw
d)
inclined plane
47.
Simple machines can change the amount of_______ needed to do work.
a)
gravity
b)
people
c)
force
d)
pulley
48.
In a second class lever, the ______ is in the middle.
a)
Effort
b)
Fulcrum
c)
Load
d)
Machine
49.

if a load of a lever is 100 newtons and the force you apply is 20 newtons, what is your mechanical advantage?


MA = resistance force / input force

a)

120

b)

5

c)

2000

d)

80

50.

What is the mechanical advantage if you lift a load of 300 newtons and you only push down with 50 newtons?


MA = resistance force / input force

a)

250

b)

50

c)

60

d)

6

51.

What is the efficiency of the machine if the input is 263 J and the output is 142 J?


Efficiency = Work output / work input x 100

a)

6.26%

b)

54%

c)

100%

d)

260%

52.

What is the ideal mechanical advantage of an inclined plane which has 4 cm height and 16 cm slope?


MA = effort distance / resistance distance

a)

1/4

b)

1

c)

16

d)

4

53.

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 machine?


Efficiency = Work output / work input

a)

0.25 J

b)

26%

c)

386%

d)

3.86 J

54.
If the weight of the block is 10N, how much force does one have to apply to lift it using this pulley (MA=2)?
a)
2N
b)
5N
c)
10N
d)
15N
55.

A box of weight W is lifted by a force F using a lever as shown below.

What is the mechanical advantage of the lever


(MA=Input Distance/Output Distance)?

a)

0.5

b)

2

c)

3

d)

6

56.

The _________ of a machine is always less than 100%.

a)

mechanical advantage

b)

friction

c)

force

d)

efficiency

57.

Why can mechanical efficiency never be 100%?

a)

No machine is strong enough.

b)

Machines are too big to allow for 100% efficiency.

c)

It can be 100%.

d)

Some energy is lost in the form of heat/sound due to friction.

58.

Real machines:

a)

don't actually exist

b)

have an efficiency less than 100%

c)

lose energy due to friction

d)

all are correct

59.
What is the equation for mechanical advantage?
a)
MA=input force*output force
b)
MA=output force/input force
c)
MA=input force/output force
d)
MA= output force - input force
60.
The work of pulling the box will be _________ if the man uses the ramp.
a)
complete
b)
more difficult
c)
easier
d)
painful

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