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Work Energy Power Review quiz

Total questions: 69

Worksheet time: 3hrs 35mins

Name
Class
Date
1.

Which of the following is defined as an energy transfer?

a)

kinetic energy

b)

work

c)

potential energy

d)

chemical energy

2.

The unit of work is

a)

watt

b)

hertz

c)

joule

d)

pascal

3.

A light plastic cart and a heavy steel cart are both pushed with the same force for a distance of 1.0 m, starting from rest. After the force is removed, the kinetic energy of the light plastic cart is ________ that of the heavy steel cart.

a)

greater than

b)

equal to

c)

less than

d)

can't say unless we know how big the force is

4.

Each of the boxes shown is pulled for 10 m across a level, frictionless floor by the force given. Which box experiences the greatest change in its kinetic energy?

a)

A

b)

B

c)

C

d)

D

e)

E

5.

Rank in order, from largest to smallest, the gravitational potential energies of the balls.

a)

1 > 2 = 4 > 3

b)

1 > 2 > 3 > 4

c)

3 > 2 = 4 > 1

d)

3 > 2 > 4 > 1

6.

Starting from rest, a marble first rolls down a steeper hill, then down a less steep hill of the same height. Ignoring friction, for which is it going faster at the bottom?

a)

Faster at the bottom of the steeper hill

b)

Faster at the bottom of the less steep hill

c)

Same speed at the bottom of both hills

d)

Can’t say without knowing the mass of the marble

7.

A small child slides down the four frictionless slides A–D. Rank in order, from largest to smallest, her speeds at the bottom.

a)

vD > vA > vB > vC

b)

vD > vA = vB > vC

c)

vC > vA > vB > vD

d)

vA = vB = vC = vD

8.

Four students run up the stairs in the time shown. Which student has the largest power output?

a)

A

b)

B

c)

C

d)

D

9.

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

10.

In the equation PE = mgh, what does the “g” mean?

a)

Acceleration due to gravity

b)

Force of gravity

c)

Weight of the object

11.

What is the unit for power?

a)

what

b)

watt

c)

joule

d)

Jewel-Osco

12.

Which requires more work – a person walking up stairs or a person running up stairs?

a)

walking

b)

running

c)

they require equal work

d)

no work is required for either because the movement is vertical

13.

Which requires more power – a person walking up stairs or a person running up stairs?

a)

walking

b)

running

c)

they require equal power output

d)

no power is required at all

14.

A basketball that is dropped bounces back up to its original height. Pick the correct energy transformation from the point when it was dropped until it returns to the original height.

a)

KE --> PE --> Elastic

b)

PE --> KE --> Elastic --> KE --> PE

c)

KE --> PE --> Elastic --> PE --> KE

d)

Elastic --> PE --> KE --> Elastic

15.

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

16.

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

17.
What is the equation for power and energy?
a)
P = E/t
b)
E = P/t
c)
T = P x E
d)
P = W/t
18.
What is being transferred as you do work?
a)
Energy
b)
Heat
c)
Power
d)
Gravitational Potential Energy
19.
How do you calculate power?
a)
P = W/t
b)
P = E/t
c)
P = w * t
d)
P = bbq/chicken
20.
How do we calculate work?
a)
W = F * d
b)
w = f * D
c)
W = F * D
d)
w = f * d
21.
How much work is being done with 200 N of force over 426 meters?
a)
85,200 J
b)
45,620 J
c)
90,480 J
d)
62,329 J
22.
The SI unit of work is?
a)
Joules
b)
Watts
c)
Newtons
d)
meters
23.
The energy of movement is...? 
a)
Kinetic
b)
Potential
24.
Energy that is stored is called...
a)
Kinetic
b)
Potential 
25.
The SI unit for power is...?
a)
Watts
b)
Joules
c)
Newtons
d)
Meters
26.
What is the formula for Gravitational Potential Energy?
a)
PE = m*g*h
b)
KE = 1/2m*v2
c)
W = F*d
d)
P = W/t
27.
a)
A is Potential, B is Kinetic
b)
A is Kinetic, B is Potential
c)
A is Power, B is Work
d)
A is Work, B is Power
28.
What is g on Earth?
a)
9.8 m/s/s
b)
9.8 m/s
c)
42 m*s
d)
42 m/s/s
29.
Energy of a rock perched on a cliff is an example of...
a)
gravitational
b)
elastic
c)
chemical
d)
kinetic
30.
If 150 Joules of work is needed to move a box 10 meters, what force was used? 
a)
1500 N
b)
15 N
c)
1.5 N
d)
150 N
31.
If 68 Joules were necessary to move a 4 Newton crate, how far was the crate moved?
a)
272 m
b)
17 m
c)
4.05 m
d)
272 cm 
32.
The faster an object moves, the ________ kinetic energy it has. 
a)
more
b)
less
c)
none of the above
d)
all of the above 
33.
Gravitational potential energy depends on the ________ and ________ of the object. 
a)
Height and mass
b)
Friction and movement
c)
Mass and Movement
d)
Height and Friction 
34.
When you release a stretched rubber band, the rubber band has ________ energy. 
a)
kinetic 
b)
potential
c)
none of the above
d)
all of the above 
35.
What is the formula for calculating the total amount of mechanical energy?
a)
ME = KE + PE
b)
KE = ME + PE
c)
PE = KE + ME
d)
ME = 1/2 mv2
36.
Why does the total amount of mechanical energy stay constant in a system?
a)
energy is not created or destroyed
b)
energy leaves
c)
energy enters
d)
energy is not converted from one form into another
37.
What is the energy of position or shape that depends on weight and height, also called stored energy?
a)
Energy
b)
Kinetic energy
c)
Potential energy
d)
Sound energy
38.
What is kinetic energy?
a)
stored energy
b)
energy of motion
c)
energy of friction
d)
energy stored in chemical bonds
39.
When a roller coaster cart falls towards the ground, what happens to its potential energy?
a)
Increases
b)
Decreases
c)
Stays the same
d)
Nothing
40.
When a rollercoaster cart moves towards the ground, what happens to the PE that it has?
a)
It transforms into KE
b)
It leaves the system
c)
Nothing
d)
It stays PE
41.
What is the kinetic energy of a ball sitting on top of a hill?
a)
0 J
b)
less than 0 J
c)
more than 0 J
42.
Based on the formula for potential energy, what 2 variables influence PE the most?
a)
mass and height
b)
mass and velocity
c)
velocity and height
d)
velocity and mass
43.
In order for work to be done, what must be true?
a)
Force acts in the same direction as the distance traveled.
b)
Force and distance are in opposite directions.
c)
Force is greater than distance.
d)
Distance is greater than force.
44.
When you carry an object, is work done on it?
a)
Yes, force is applied in the same direction as the distance it travels.
b)
No, force is applied in a different direction than distance traveled.
45.
In which situation is NO work done?
a)
picking up a book bag
b)
dropping the bookbag
c)
carrying the bookbag
d)
none of these
46.
A 5000N block is lifted 10 m. How much work was done?
a)
50000 J
b)
5000 J
c)
500 J
d)
50 J
47.
If 150 Joules of work is needed to move a box 10 meters, what force was used? 
a)
1500 N
b)
15 N
c)
1.5 N
d)
150 N
48.

A roller coaster whose average speed is 32 m/s is at the top of a 72m hill and weighs 966N. At the top of the hill the coaster car has ___________________ energy.

a)

only kinetic energy

b)

only potential energy

c)

mostly kinetic energy

d)

both kinetic and potential energy

49.

What is the potential energy of a 3kg ball that is on the ground?

a)

0 J

b)

3 J

c)

9.8 J

d)

29.4 J

50.

A 100 N force is applied to move an object a horizontal distance of 5 meters at constant speed in 10 seconds. How much power is done?

a)

50J

b)

50W

c)

500J

d)

500W

51.

Which statement illustrates work done?

a)

A weightlifter holds a barbell above her head.

b)

A teacher applies a force to a wall and becomes exhausted.

c)

A rolling marble hits a note card and moves it across a table.

d)

A waiter carries a tray full of meals across a dining room at a constant speed.

52.

What is the energy possessed by the cart?

a)

potential energy

b)

kinetic energy

c)

mostly potential

d)

mostly kinetic

53.

If the mass of the cart is 15kg, how much is the potential energy of the cart?

a)

0J

b)

1.2J

c)

6J

d)

58.8J

54.

If the mass of the cart is 8.12kg, what is the kinetic energy of the cart?

a)

0J

b)

1.2J

c)

6J

d)

58.8J

55.

What is the total mechanical energy of the object?

a)

100J

b)

75J

c)

50J

d)

25J

56.

A 735kg empty roller coaster is at its starting point whose distance from the ground is 150m. After a while, it moves at point B whose distance from the ground is 120m. What is the kinetic energy of the coaster at point B?

a)

1,080,450J

b)

864,360J

c)

216,090J

d)

0J

57.
How much work is done in holding a 15 N sack of potatoes while waiting in line at the grocery store for 3 minutes?
a)
15 J
b)
45 J
c)
0 J
d)
5 J
58.

The roller coaster car has a mass of 500 kg. It is pulled from position 1 to 2 (30 m) by a motor. At the top of the ride the vertical distance top to bottom is 20 m. The motor pulls the car with a 4000 N force. Calculate the work done getting the car to the top of the ride.

a)

100 000J

b)

120 000J

c)

800 000J

d)

90 000J

59.

Energy Efficiency is calculated by useful energy (Energy Out) divided by energy consumed (Energy In) , expressed as a percentage

a)

False

b)

True

60.

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

61.

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

62.

A student needs 10 Newtons of force to lift a box to the top of a 2 meter shelf. How much work do they do?

a)

12 J

b)

8 J

c)

20 J

d)

5 J

63.

A worker climbs a ladder and does 8 J of work on a 2 N object. What is the distance they lift the object?

a)

18 m

b)

4 m

c)

10 m

d)

6 m

64.

What is mechanical energy?

a)

total kinetic energy

b)

the energy of motion

c)

total kinetic and potential energy

d)

temperature plus heat

65.

At which point of this roller coaster is the energy 1/2 kinetic and 1/2 potential?

a)

A

b)

B

c)

C

d)

D

66.

Two workers use 100 N of force to move a sofa 2 meters in 2 seconds. How much power is required?

a)

100 watts

b)

400 watts

c)

104 watts

d)

50 watts

67.

________________ is the rate at which work is done.

a)

Power

b)

Work

c)

Time

d)

Energy

68.

The unit of power (aka Joule per second)

a)

Joule

b)

Minute

c)

Watt

d)

Pound

69.

Energy that is stored and held in readiness

a)

Kinetic

b)

Mechanical

c)

Work

d)

Potential

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