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force

a push or pull

gravity

force of attraction between objects due to mass

friction

force opposing motion between touching surfaces

velocity

speed in a particular direction

static

friction that disappears when an object starts moving

acceleration

rate at which velocity changes

motion

changing postion over time

speed

rate at which an object moves

balanced

forces producing a net force of zero

net force

result of combined forces on an object

weight

measure of the force of gravity on an object

mass

amount of matter in an object

rolling

friction between wheels and the floor

newton

unit used to express force

sliding

kinetic friction that makes brakes work

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