# 8 Forces and Motion

### 11 terms by lauriep

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### gravity

the force of attraction between all masses in the universe

### inertia

the tendency of a body to resist any change in its motion; it stays at rest or in motion unless acted upon by an external force

### force

a push or a pull that acts on an object

### motion

the act of changing location from one place to another

### mass

the amount of matter in an object

### weight

A measure of the amount of force of gravity on an object

### acceleration

the rate at which velocity changes over time; an object accelerates if its speed, direction, or both change

### speed

the ratio of the distance an object moves to the amount of time the object moves

### Newton's First Law of Motion

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 Second Law of Motion

The acceleration of an object depends on the mass of the object and the amount of force applied.

### Newton's Third Law of Motion

for every action there is an equal and opposite reaction

Example: