Work, Energy and Power
Physics · 50 practice questions
Definition of work, energy and power; forms of energy and conservation of energy; transformation between forms of energy; area under the force-distance curve; energy and society — sources of energy, renewable and non-renewable energy, uses of energy, energy and development, environmental impact of energy use, energy crises, dams and nuclear/solar energy.
- Differentiate between work, energy and power and compare forms of energy.
- Apply the principle of conservation of energy and examine transformation between forms.
- Interpret the area under a force-distance curve and solve numerical problems in work, energy and power.
- Itemize sources of energy and distinguish renewable from non-renewable sources.
- Explain the importance and environmental impact of energy use.
Try a few questions
- Practice question 1
A machine has a power rating of 500W and operates for 2 minutes (120 seconds). The total work done is
- A.60,000 J
- B.1,000 J
- C.620 J
- D.500 J
Show the answer
A. 60,000 J
Work done = power x time = 500 x 120 = 60,000 J.
- Practice question 2
Nuclear energy, while an efficient energy source, raises environmental and safety concerns mainly related to
- A.excessive release of greenhouse gases during normal operation
- B.a complete lack of any usable energy output
- C.radioactive waste disposal and the risk of accidents
- D.an inability to generate any electrical power at all
Show the answer
C. radioactive waste disposal and the risk of accidents
Managing hazardous waste and preventing serious accidents are the primary safety concerns with nuclear power.
- Practice question 3
Solar energy is mainly harnessed using
- A.wind turbines to convert kinetic energy of air into electrical energy
- B.solar panels (photovoltaic cells) to convert light energy directly into electrical energy
- C.dams to convert the energy of flowing water into electrical energy
- D.nuclear reactors to convert nuclear energy into electrical energy
Show the answer
B. solar panels (photovoltaic cells) to convert light energy directly into electrical energy
Photovoltaic cells specifically capture light energy and convert it directly into usable electricity.
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