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Conservation of Energy and Work

Total questions: 23

Worksheet time: 1hrs 9mins

Name
Class
Date
1.
As a pendulum swings from its highest to lowest position, what happens to its kinetic and potential energy? 
a)
The PE and KE increase and decrease together
b)
The PE decreases while the KE increases 
c)
Impossible to know without knowing the mass  
2.
At which point is potential energy greatest?
a)
W
b)
X
c)
Y
d)
Z
3.

At which point is kinetic energy greatest?

a)
W
b)
X
c)
Y
d)
Z
4.
A 40 kg crate is picked up by a crane to a height of 50m. The crate falls. What is the velocity of the crate just before it hits the ground?
a)
2000 Joules
b)
19,600 Joules
c)
19,600 m/s
d)
31.3 m/s
5.
If the Total Mechanical Energy is 50J, Potential Energy is 40 J, what is the Kinetic Energy?
a)
1 J
b)
10 J
c)
90 J
6.
Which variable is always constant (doesn't change)?
a)
mass
b)
height
c)
velocity
d)
None
7.
What is the v in this equation? Choose the one with the CORRECT unit!
a)
volume (m3)
b)
velocity (m/s)
c)
velocity (m/s2)
d)
volume (v)
8.
What is the g? Choose the one with the correct unit!
a)
mass (kg)
b)
gravity (m/s)
c)
gravity (m/s2)
d)
grams (g)
9.
At the top of the roller coaster, which energy is ALWAYS present?
a)
Potential Energy
b)
Kinetic Energy
c)
Mechanical Energy
d)
None
10.

Energy that is stored in a system, ready to be used, is called ____________ energy.

a)

Kinetic

b)

Potential

c)

Conserved

d)

Power

11.

The Law of Conservation of Energy states that energy is never __________________ or _________________, only transferred.

a)

created, destroyed

b)

created, subtracted

c)

added, subtracted

d)

destroyed, subtracted

12.

In physics, we observe that energy can be transferred....

a)

....from kinetic to potential.

b)

....from potential to kinetic.

c)

Both of the other answers are correct

d)

No answer is correct.

13.
In diagram 2, if the mass of the car is 600 kg, what is the change in potential energy from point A to point B?
a)
411,600 J
b)
294,000
c)
176,400 J
d)
117,600 J
14.
In diagram 2, if the 600 kg cart is initially at rest, what is its velocity at point B?
a)
19.8 m/s
b)
15.0 m/s
c)
10.3 m/s
d)
3.8 m/s
15.

1. A ball has a 17 J of kinetic energy and its mechanical energy is 25 J. If the ball has a mass of 3.2 kg, what is its height above the ground?

a)

0.26 m

b)

0.52 m

c)

5.2 m

d)

25 m

16.
A 5 kg ball is lifted 12 m above the ground. It's gravitational potential energy is
a)
60 J
b)
600 J
c)
17 J
d)
2.4 J
17.
A pendulum is released from point C.  Which statement is correct as it  swings from C to A?
a)
The PE increases and KE decreases
b)
The KE increases and PE decreases.
c)
The PE is maximum at A.
d)
The KE is maximum at C and B.
18.
When a 65 kg skydiver jumps from a plane, her speed steadily increases until air resistance provides a force that balances the force due to free fall.  How fast is the skydiver falling if her kinetic energy at the moment is 704000J?
a)
21661.53 m/s
b)
147.17 m/s
c)
22880.0 km/s
d)
10830.76 m/s
19.

What is the two things that need to occur for work to have been done?

a)

force and movement

b)

movement and direction

c)

constant force and power

d)

power and work

20.

If you push a cart with a force of 60 N for 2 m... how much work have you done?

a)

120 J

b)

30 J

c)

120 N

d)

30 N

21.

If Jay Loppy pushes his van 20 meters how much work is done?

a)

2,000 J

b)

40,000 J

c)

10,000 J

d)

800,000 J

22.
In which of the following situations do your arms do work on books?
a)
holding a heavy stack of books while standing
b)
carrying a heavy stack of books
c)
dropping a stack of books onto a table
d)
picking up a pile of books from the floor
23.

Hans Full is pulling on a rope to drag his backpack to school across the ice. He pulls upwards and rightwards with a force of 22.9 Newtons at an angle of 35 degrees above the horizontal to drag his backpack a horizontal distance of 129 meters to the right. Determine the work (in Joules) done upon the backpack.

a)

2.42 x 103 J

b)

2.22 x 103 J

c)

3.12 x 103 J

d)

1.84 x 103 J

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