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Chapter 4, 7

Revise Work, Energy and Power

QuestionAnswer
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.
Created by: SC Dave