- friction between two or more solidobjects that are not moving relative toeach other

- dynamic friction occurs when two objects aremoving relative to each other and rubtogether

- the force keeping objects moving with a circularpath(orbit) acts towards the centre of the circle of motion.IF the force stops, the object will continue in a straightline.

- Reaction force

- Action force

- Do not encounter air resistance

- All accelerate downwards at arate of 9.8m/s/s

- speed = distance / time

- how fast an object is moving

- scalar quantity(described bymagnitude alone)

- velocity = displacement / time

- the rate at which an objectchanges its position

- vector quantity(described byboth a magnitude and adirection)

- final velocity - initial velocity / time

- the rate at which the velocity ofa body changes with time

- vector quantity

- Distance-time graph

- Speed-time graph