Work Quiz
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5 questions, one answer each
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1. Which of the following correctly defines mechanical work?
- A. Work done is equal to the energy transferred when a force acts over a distance
- B. Work done is the rate at which energy is used
- C. Work done is the total amount of force applied to an object
- D. Work done is the time taken for an object to move
2. A force of 50 N is applied to move an object 2 metres in the direction of the force. Calculate the work done.
- A. 25 J
- B. 100 J
- C. 52 J
- D. 48 J
3. A motor lifts a load and transfers 1200 J of electrical energy. Assuming no energy losses, what is the relationship between the work done by the motor and the energy transferred?
- A. The work done is greater than the energy transferred
- B. The work done equals the energy transferred (1200 J)
- C. The work done is less than the energy transferred
- D. There is no relationship between work and energy transfer
4. A student pushes a box with a force of 15 N, but the box only moves 0.8 m before stopping due to friction. The energy transferred as work done on the box is:
- A. 18.75 J
- B. 12 J
- C. 15.8 J
- D. 14.2 J
5. A crane does 45,000 J of work lifting a girder vertically upwards. What can be concluded about the energy change of the girder during this process?
- A. The girder's kinetic energy increased by 45,000 J
- B. The girder's total energy increased by 45,000 J
- C. The girder lost 45,000 J of energy
- D. The work done is independent of any energy change