Name _____________________________ Date ___________ Period ____
Practice Test: Energy, Work and Power
Matching: Match the following vocabulary terms with the proper metric unit of measurement.
Answers may be used more than once.
_______1.
_______2.
_______3.
_______4.
time
distance
height
Speed
a.
b.
c.
d.
meters
kilometers
meters/second
second
Matching: Match the following forms of energy with the proper source for each. (Think of where
each comes from)
_______5. thermal or heat energy
_______6. electrical energy
_______7. chemical energy
_______8. nuclear energy
_______9. mechanical energy
a. a windmill
b. the sun
c. a battery
d. friction
e. a TV
Written Section: (Hint – in the problems a bolded unit usually means a conversion.)
10. Identify the energy conversions present as a log burns.
11. You lift a 60 N toy to put it on a shelf that is 1.4 m off of the ground. Calculate the
amount of work you did.
Identify the equation(s):
Identify the variables:
Answer:
Show work:
12. A crane does 14,300 J of work to lift a beam. It takes the crane 85.0 seconds to
complete that process. Calculate the power.
Identify the equation(s):
Show work:
Identify the variables:
Answer:
13. An 75.0 W light bulb burns for 24.3 minutes. Calculate the amount of energy (work)
produced?
Identify the equation(s):
Show work:
Identify the variables:
Answer:
14. A machine can output 420 W. How long would it take the machine to accomplish 4,500
J of work?
Identify the equation(s):
Show work:
Identify the variables:
Answer:
15. A tennis ball is hit and travels 42 m/s. If the tennis ball has a mass of 0.290 kg,
calculate the kinetic energy of the ball.
Identify the equation(s):
Identify the variables:
Answer:
Show work:
16. A 1.93 kg can sits on a shelf 1.6 m off the ground at Wal-Mart. Calculate the potential
energy of the can.
Identify the equation(s):
Show work:
Identify the variables:
Answer:
17. The can from the previous problem falls. Calculate the speed (velocity) of the can when
it hits the ground below.
Identify the equation(s):
Identify the variables:
Answer:
Helpful Equations:
Ek = ½ mv2
Eg = mgh
g = 9.81 m/s2
P = W/t
W = Fd
Eg = Fh
Show work: