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# Gravity and Motion

### Chapter 1 lesson 3

TermDefinition
Force A force is a push or pull
Gravity Force that attracts objects toward each other. It pulls the moon toward Earth, keeping it in orbit.
The strength of the force of gravity between two objects depends on what two factors? the masses of the object and the distance between them
Law of universal gravitation states that every object in the universe attracts every other object.
Mass is the amount of matter in an object.
Weight the measure of force of gravity on an object
How does mass affect the force of gravity? the more mass an object has, the greater the force it can exert
How does distance affect the force of gravity? the greater the distance between two objects, the smaller the force of gravity
Inertia The tendency of an object to resist a change in motion.
Newton's first law of motion 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.
Why do the Earth and moon remain in orbit? Newton concluded that inertia and gravity combine to keep Earth in orbit around the sun and the moon in orbit around Earth.
What keeps Earth from falling into the sun? The answer is inertia
What orbits another object and can be natural or man made? A satellite
During the Apollo 15 free fall experiment, which object fell at the same rate as the hammer? A feather because there in no air resistant on the moon.
What was the purpose of the Apollo 15 free fall experiment? To test whether the objects would fall at the same rate of speed.
Created by: ldillon