motion vocabulary
Terms
undefined, object
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- motion
- an object's change in position over time when compared with a reference point
- speed
- the rate at which an object moves;speed depends on the distance traveled and the time taken to travel that distance
- velocity
- the speed of an object in a particular direction
- acceleration
- the rate at which velocity changes; an object accelerates if its speed changes, if its direction changes, or if both its speed and its direction change
- force
- a push or pull; all forces have both size and direction
- newton
- the SI unit of force
- net force
- the force that results form combining all the forces exerted on an object
- friction
- a force that opposes motion between two surfaces that are touching
- gravity
- a force of attraction between objects that is due to their masses
- weight
- a MEASURE of the gravitaional froce exerted on an object, usually on the Earth
- mass
- the amount of matter that something is made of