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Quiz 2 (Semestral 2) – Work, power and energy.
Name: ………………………………………
Class: ……………………….
Answer all question. Show your working solution.
1. What is energy?
………………………………………………………………………………… [1]
2. Explain the principle of conservation of energy.
………………………………………………………………………………… [1]
3. A car of mass 500 kg is moving at of 10 m/s. The engine does work on the car
and the speed increases to 16 m/s.
a) Calculate its initial energy.
[2]
b) Calculate its final energy.
[2]
c) How much work is done by the engine to increase the speed of the car?
[2]
4. A car, travelling on a straight horizontal road, has 1.6 MJ of kinetic energy. It
accelerates for 20 s until it has 2.5 MJ of kinetic energy.
a) Calculate its changes of energy.
[2]
b) Calculate the average power output used to increase the kinetic energy
of the car.
[3]
5.
a) State the name of the diagram above.
……………………………………………………………………… [1]
b) There are two types of energy produced from the diagram above. State
the type of energy.
……………………………………………………………………… [1]
……………………………………………………………………… [1]
c) What is the total amount of energy produced by the diagram.
……………………………………………………………………… [1]
6. Energy can be dissipated.
a) State the definition of dissipated energy.
………………………………………………………………………………..
[1]
b) Give two energy that can be dissipated.
…………………………………………………………………………….. [1]
…………………………………………………………………………….. [1]