The force that attracts all objects toward each other
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What is Newton's law of universal gravitation?
Every object in the universe attracts every other object
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What does the strength of the force of gravity depend on?
The mass of two objects and the distance between them
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What happens to the strength of gravity if the mass of an object increases?
The strength of gravity increases
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What happens to the strength of gravity if the distance between two objects increases?
The strength of gravity decreases
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What is inertia?
The tendency of an object to resist a change in motion
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What is Newton's first law of motion?
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
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How do objects stay in orbit?
Objects have a tendency to keep moving forward in a constant direction and speed due to inertia, but gravity causes the object's path to curve towards a mass.