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# Science Ch. 15

### Lesson 1: Forces, Motion, and Work

TermDefinition
acceleration a change in velocity
force a push or pull on an object
friction a force that resists motion of one surface across another
gravity a force that causes objects to be pulled toward one another
inertia an objects resistance to a change in motion
motion a change in an object's position
newton unit of measurement for force 1 kg of mass 1 m/s sq.
speed how far an object moves in a given amount of time distance divided by time
velocity measure of an object's speed plus direction
Newton's 1st Law an object at rest will stay at rest and an object in motion will stay in motion unless acted on by an outside force
Newton's 2nd Law A relationship between force, mass and acceleration Force = mass x acceleration
Newton's 3rd Law for every action, there is an opposite and equal reaction
Created by: mnordby