speed - how fast an object is moving
instantaneous speed - speed of an object at a particular point in time
Velocity - describes an objects speed and direction
the gradient of velocity-time graph = how quickly object increases in speed
steeper the slope - faster the speed is increasing
Forces - occurs when two objects interact with each other
Gravity - force of attraction between all masses
Air resistance - air tries to slow an object down
Reaction of the surface - object is pulled down on to the surface by gravity, surface pushes up on to the object with equal force.
Friction - the force that tries to stop two objects moving as they slide past.
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