Test: Work and Energy

Multiple Choice Questions:

1. Which of the following is a scalar quantity? a) Force b) Velocity c) Acceleration d) Work

2. A car is moving with a constant velocity. Which of the following statements is true? a) The car is not doing any work. b) The car is doing positive work. c) The car is doing negative work. d) The car’s work cannot be determined without additional information.

3. Which of the following is an example of potential energy? a) A moving car b) A stretched rubber band c) A rolling ball d) A flying bird

4. The work done by a force can be calculated by multiplying the force applied by the: a) Distance traveled b) Time taken c) Acceleration d) Velocity

5. Which of the following is a unit of work? a) Joule b) Newton c) Watt d) Kilogram

6. A person pushes a box with a force of 50 N for a distance of 5 meters. How much work is done? a) 10 J b) 25 J c) 50 J d) 250 J

7. A ball is thrown vertically upwards. At the highest point of its trajectory, its kinetic energy is: a) Maximum b) Minimum c) Zero d) Cannot be determined without additional information

8. Which of the following is an example of kinetic energy? a) A stationary rock on a hill b) A compressed spring c) A moving bicycle d) A book on a shelf

9. The law of conservation of energy states that: a) Energy can be created but not destroyed b) Energy can be destroyed but not created c) Energy can neither be created nor destroyed, only transferred or transformed d) Energy can be created and destroyed

10. A machine is able to do 100 J of work in 10 seconds. What is the power output of the machine? a) 10 W b) 100 W c) 1 W d) 1000 W

Problems:

1. A force of 20 N is applied to move an object a distance of 5 meters. Calculate the work done.

2. A spring with a spring constant of 100 N/m is compressed by 0.2 meters. Calculate the potential energy stored in the spring.

3. A car with a mass of 1000 kg is moving at a velocity of 20 m/s. Calculate its kinetic energy.