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Physics Free Revision Notes

1: Heat and Temperature

Temperature is the degree of hotness or coldness of a body.Its symbol is T and SI unit is Kelvin.Temperature is measured using thermometer Heat is the amount of thermal or internal energy of a body.He

2: Energy Resources
Efficiency = (useful energy output/useful energy input) x 100 Mankind needs to find an alternative to fossil fuels because they will run out. Nuclear Fusion Combine two light hydrogen atoms This make

3: Gravity
Gravity: Is the force of attraction between all masses Mass: Is the amount of matter in an object Weight: Is caused by the pull of gravity weight = mass x gravitational force (10N/kg) = X newtons Newt

4: Light and Sound
Light Is the movement of electrons we see things because light rays bounce off objects into our eyes. Light travels in straight lines Principle of least time - tates light takes the path that requi

5: Waves, Transfer of Energy
  Transverse wave: Particle movement 90 degrees perpendicular to the place of rest. The above image is a diagram of a transverse wave. Examples: Radio waves, light waves, x-rays, gamma rays. Ampl

6: Energy and Electricity
Potential Difference: the difference in electrical potential between two points measured using a voltmeter has to be in a parralel circuit to whatever is being measured. As it offers too much resista

7: Using Electricity
You need a complete circuit for making electricity Current: Flow of electrons measured with an ammeter size of current is the rate at which charge is flowing Charge (Q) is measured in Coulombs (C -

8: Energy Transfer by Heating
Heating is a form of energy transfer Conduction through solids atoms at hot end vibrate. Electrons colide. Atoms bump into atoms next to them and make them vibrate. good conductors because atoms are

9: Engery Transfer
When energy is used it does no dissapapear, it changes/transfer to a different form of energy Energy cannot be created or destroyed it can only be transferred from one form to another Forms of Energy

10: Forces and Motion
Force force is measture in newtons F=ma force = mass x acceleration Unbalanced forces=motion speed s=d/t acceleration (v-u)/t veloctiy v=at or if objects are moving, it stays at constant sp


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