Work, Energy and Power

21. The work done by a force can be calculated by multiplying the:

a) Force applied and time taken

b) Force applied and distance moved

c) Mass and acceleration

d) Velocity and time taken

22. A 500 kg car is moving at a velocity of 10 m/s. What is its kinetic energy?

a) 250 J

b) 500 J

c) 2500 J

d) 5000 J

23. Which of the following is an example of mechanical energy?

a) Heat energy

b) Light energy

c) Sound energy

d) Potential energy

24. The power output of a machine is 200 W. How much work can it do in 2 minutes?

a) 400 J

b) 800 J

c) 2400 J

d) 4800 J

25. A ball is rolling down a hill. What happens to its potential energy?

a) It increases

b) It decreases

c) It remains constant

d) It cannot be determined