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Physics 2.8-9 Energy, Work, and Conservation of Energy

Total questions: 21

Worksheet time: 19mins

Name
Class
Date
1.
Calculate the KE of a runner that has a mass of 80 kg and is running at a velocity of 8 m/s
a)
5120 J
b)
320 J
c)
640 J
d)
2560 J
2.
Energy due to motion is ____________ energy. 
a)
Potential 
b)
Energy
c)
Kinetic
d)
Friction
3.
__________ is stored energy. 
a)
Potential
b)
Kinetic
c)
None of the above 
d)
All of the above 
4.
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 
5.
When you stretch a rubber band, you are storing __________ energy. 
a)
gravitational potential
b)
elastic potential
c)
kinetic 
d)
none of the above 
6.
Energy can not be created or destroyed, only converted from one form to another.
a)
true
b)
false
7.
At which point is potential energy greatest?
a)
W
b)
X
c)
Y
d)
Z
8.
As a pendulum swings from its highest to lowest position, what happens to its kinetic and potential energy? 
a)
Both the potential energy and kinetic energy decrease
b)
The potential energy decreases while the kinetic energy increases 
c)
The kinetic energy decreases while the potential energy increases 
d)
Bothe the potential energy and kinetic energy increase 
9.
At which point is kinetic energy greatest? 
a)
W
b)
X
c)
Y
d)
Z
10.
When a pendulum swings, at which point is kinetic energy highest?
a)
1
b)
2
c)
3
d)
4
11.
When a pendulum swings, at which point is potential energy at its greatest?
a)
1
b)
2
c)
3
d)
4
12.
if you push a cart with a force of 60 N resulting in 120 J of work.. how far did you move the cart? 
a)
7200 m
b)
0 m
c)
2 N 
d)
2 m
13.
What is energy?
a)
the ability to do work
b)
mass and volume
14.

Which of the following has kinetic energy?

a)

a rock poised for a fall

b)

an archer's bow that is drawn back

c)

a rolling bowling ball

d)

A spring that has been compressed

15.
Energy of a rock perched on a cliff is an example of...
a)
gravitational
b)
elastic
c)
chemical
d)
kinetic
16.
Energy from a compressed spring would be an example of...
a)
kinetic
b)
elastic
c)
gravitational
d)
chemical
17.

How much work is being done with 200 N of force to the right on object that moves 426 meters to the right? (assume the force and displacement are in the same direction)

a)

85,200 J

b)

45,620 J

c)

90,480 J

d)

62,329 J

18.
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 
19.

What is the formula for calculating the total amount of mechanical energy?

a)

ME = KE + PE

b)

KE = ME + PE

c)

PE = mgh

d)

ME = 1/2 mv2

20.

A 78-kg skydiver has a speed of 62 m/s at an altitude of 870 m above the ground. Determine the total mechanical energy of the skydiver.

a)

816 kJ

b)

15.0 kJ

c)

666 kJ

d)

668 kJ

e)

500 kJ

21.

If a spring is compressed from a natural length of 0.5 m to 0.1 m and has a spring constant of 640 N/m, what is the elastic potential energy stored in the spring?

a)

80 J

b)

128 J

c)

51.2 J

d)

160 J

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