Physics Equations

You MUST learn you equations if you want to do well. There will be lots of marks for using them.

Here is a summary of the equations you need to know and what the quantities in them mean. (Red = HIGHER ONLY)

Mechanics Equations

	Speed (or velocity) (m/s) How fast an object is moving. What distance it covers in a certain time. (velocity = in a certain direction)
	Acceleration (m/s2) How quickly the speed of an object is increasing.
	Force (Newtons, N) A push or pull that can change the shape of an object or change its state of motion.
	Weight (Newtons, N) The force of attraction due to gravity.
	Work (Joules, J) The energy transferred when a force acts over a certain distance.
	Momentum (kg m/s) An object's mass x its velocity. Whether it is + or - depends on its direction of motion.
	Kinetic Energy (Joules, J) The energy an object has because it is moving.

Electricity Equations

	Power (Watts, W) How much energy a device transfers every second Energy Transferred (Joules, J) Electrical devices transfer (change) electrical energy into other forms, e.g. heat, kinetic etc.
	Voltage or Potential Difference (Volts, V) The amount of energy that the charge flowing through a device transfers Current (Amps, A) How much charge flows through a device every second
	Charge (Coulombs, C) This flows in a circuit carrying energy. Electrons carry a negative charge.