* Forces are usually a push or a pull.
* Forces are measured using a newtonmeter and the unit of force is Newtons.
* Forces work in pairs - as you push down on a table the table pushes up with equal force.
* When there is no change in velocity or shape of an object then the forces are balanced e.g. book on table
* When there is a change in velocity or shape of an object then the forces are not balanced e.g. person falling through ice.
* An example of a force is gravitational force. To work out the weight of an object (with gravity working on it) you use the following formula:
* Weight (N) = mass (kg) x gravitational force (N/kg)
* The main formula to use to work out forces is:
* Force (N) = mass (kg) x acceleration (m/s/s)
OR F=ma