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Brief Questions and Answers (3 marks each)
1. A car is moving with a constant speed along a straight road. Is there any work done on the car?
2. Does the work done in raising a box up in a building depend upon how fast it is raised up? Through which path? To how much height?
3. Work done on the body either speeds it up or slows it down. Keeping this in mind, explain how much work is done by centripetal force on an orbiting satellite?
4. A car has kinetic energy 'E'. By what factor does its kinetic energy change if its velocity is doubled?
5. A bullet is fired from a gun, and it penetrates into a sand wall and stops. Where is its kinetic energy used?
6. An LED light bulb has an efficiency of 80%. Does it violate the conservation of energy principle?
7. How does using renewable energy sources contribute to reducing environmental impact compared to non-renewable sources?
8. Will we eventually rely entirely on renewable energy sources? Why or why not?
9. How can increasing the power of a machine impact its energy consumption?
10. A perpetual engine has an efficiency equal to 1. Why will it not work?