Transcript Energy Quiz

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Energy Quiz
1-18-06
True or False
1.The units of work are the same as the units of
energy.
2.Potential energy is energy due to the motion
of an object.
3.Any moving object will keep moving until the
energy in it runs out.
5.Work is equal to the product of force and
time.
6.A joule is equivalent to a newton·meter.
7.A weightlifter holding a 100-kg barbell over
his head is doing twice as much work as a
weightlifter holding a 50-kg barbell over his
head.
Multiple choice:
11.The gravitational potential energy of a
falling object is transformed into
a. power
b. weight
c. speed
d. kinetic energy
e. work
13.The gravitational potential energy of a 1kg mass that is 3 meters from the floor is
a. 3 kg·m
b. 3 m/kg
c. 29.4 joules
d. 3 joules
14.The diagram represents a 20-N force
pulling a 5-kg object up a hill at a constant
rate of 2 meters per second. The kinetic
energy of the moving object is
a. 50 J
30 m
b. 15 J
20 N
10 m
c. 10 J
d. 5 J
15.At what point in its fall does the kinetic
energy of a freely falling object equal its
potential energy?
a. at the start of the fall
b. at all points during the fall
c. halfway between the start and the end
d. at the end of the fall
16.A basketball player who weighs 600 N
jumps 0.5 meters off the floor. What is her
17.A force of 2 newtons drags a 2.5 N shoe
across the floor at constant velocity for 2
meters. What is the work done against
friction?
a. 4 J
b. 1 J
c. 0 J
d. 5 J
e. 10 J
Switch papers with someone. Count the number
correct and write it at the top of the paper.
1. T
7. T
13. C
2. F
8. F
14. C
3. F
9. T
15. C
4. F
10. T
16. C
5. F
11. D
17. A
6. T
12. C