Unit 6 – Energy, Work and Power
2. SI unit of energy and work.
3. Energy can be ______ from one form to another.
4. Energy can neither be created nor ______ in any process.
6. A spring or rubber band possesses _______ potential energy when it is compressed or stretched.
9. Energy is defined as the _______ to do work.
12. Energy output is always _____ than energy input.
13. ________ = (useful energy output ÷ energy input) x 100 %
14. When a hammer drives a nail into a wood block, energy is wasted in the form of sound energy and ______ energy.
16. The rate of work done or rate of energy conversion.
17. When a hammer is raised, it possesses _________ potential energy.
18. Work is only done when an object moves under the _______ of a force.
1. The energy an object has because of its motion.
3. A type of potential energy an object stores (eg. In food or fossil fuels like coal and oil).
5. SI unit of power.
7. No work is done when the direction of the applied force and the direction in which the object moves are ________ to each other.
8. Work done = Constant force x distance moved in the _____ of the force
10. The principle of __________ of energy states that the total amount of energy remains constant.
11. As a pendulum swings, some of its total energy is converted to thermal energy due to ________ forces.
15. Kettle A takes less time to boil the same amount of water than kettle B. Kettle A is _____ powerful than kettle B.