11. Which of the following is an example of potential energy?
a) A moving car
b) A falling rock
c) A stretched spring
d) A spinning top
12. The unit of energy is the same as that of work because:
a) Energy and work are the same thing
b) Energy and work are measured using the same instrument
c) Energy is the ability to do work
d) Energy and work are both scalar quantities
13. A 50 N force is applied to move an object a distance of 10 m. What is the work done on the object?
a) 500 J
b) 5 J
c) 50 J
d) 0.5 J
14. A car engine produces 2000 W of power. How much work can it do in 10 seconds?
a) 2000 J
b) 200 J
c) 20,000 J
d) 20 J
15. Which of the following factors affect the power output of a machine?
a) Force applied and distance moved
b) Force applied and time taken
c) Distance moved and time taken
d) Force applied, distance moved, and time taken
