1Force
Anything which can cause an object to change its motion, direction or shape
2Weight
The force with which an object is pulled towards the Earth by gravity
3Friction
force that opposes the sliding motion between two surfaces
4Lubricant
A substance that reduces friction
5Calculating weight
weight (N) = mass (kg) x gravity
6Balanced forces
Cause an object to remain stationary or continue at a constant velocity
7Unbalanced forces
Cause an object to accelerate or decelerate
8Instrument used to measure force
Newton meter
10Hooke's Law
The extension of a spring is directly proportional to the applied force