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Chapter 4, 7
Revise Work, Energy and Power
Question | Answer |
---|---|
What is energy? | Energy is the ability to do work. |
What units is energy measured in? | Joules (J). |
Name the different forms of energy E.g. Light Energy, …. | Light, Heat, potential, Kinetic, Nuclear, Sound, Electrical, Chemical. |
State the Principle Of Conservation of Energy. | Energy cannot be created or destroyed only converted from one from to another. |
What is meant by Renewable Energy? | Renewable energy is a any form of energy that will not run out. |
What is meant by Non- Renewable Energy? | Non-Renewable energy is any form of energy that will run out and not be available any more. |
Name 2 advantages and 2 disadvantages to renewable energy sources. | Advantages: Free energy, Will not run out. Disadvantages: Expensive to build initially, not always available (solar will not work at night). |
Name 2 advantages and 2 disadvantages to non-renewable energy sources. | Advantages: Cheap initially, readily available. Disadvantages: Will run out, they pollute. |
What is Nuclear energy? | Nuclear energy is what we get from splitting atoms inside reactors. |
Name 2 advantages and 2 disadvantages to nuclear energy. | Advantages: Cheap energy, efficient (lots of power for not much fuel) Disadvantages: Waste is radioactive for thousands of years, Potential for nuclear weapon development comes with nuclear power plants. |
What is work? | Work is the force acting on an object and the displacement caused by that force. |
What units is work measured in? | joules (J). |
What is the formula for calculating the amount of work done? | Work is equal to the Force by the Displacement (s). W=Fs |
If a person moves an object whose force is 40 newtons over a distance of 5 meters how much work did that person do? | 160 J. |
What is Power? | Power is the rate at which work is being done. |
What units is power measured in? | Watt (W). 1 Watt is equal to 1 Joule per second. |
What is the formula for calculating power? | Work=Power by Time. W=PT |
If a machine gets 2000 joules of work done in 10 seconds what is the power of that machine? | 200W. |