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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