Physics Revision Notes

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 click here for full revision note

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 click here for full revision note

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 click here for full revision note

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 click here for full revision note

  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 click here for full revision note

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 click here for full revision note

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 - click here for full revision note

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 click here for full revision note

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 click here for full revision note

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 click here for full revision note