# Chapter 1 - section 2: Gravity and Motion

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Section 2: Gravity and Motion

### Force

a push or a pull exerted on an object.

### Gravity

The attractive force between objects; its strength depends on their masses and the distance between them.

### Law of Universal Gravitation

The scientific law that states that every object in the universe attracts every other object.

### Mass

The amount of matter in an object.

### weight

The force of gravity on an object.

### inertia

The tendency of an object to resist a change in motion.

### Newtown's first law of motion

The scientific law that states that an object at rest will stay at rest and an object in motion will stay in motion with a constant speed and direction unless acted on by a force.

### The strength of the force of gravity between two objects depends on two factors:

The masses of the objects and the distance between them.

### Name the two facts that Newton concluded to keep Earth in orbit around the sun and the moon in orbit around Earth

inertia and gravity

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