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Acceleration directed toward the center of a circular path
Centripetal Acceleration

The motion of a body when only the fource of gravity is acting on it
Freefall

Motion of an object revolving about a single axis
Circular motion

the speed of an object in circular motion
Tangential speed


Motion of an object when tangential speed is constant
Uniform Circular Motion

Force that causes centripetal acceleration
Centripetal Force

The mutual force of attraction between particles of matter
Gravitational Force

The speed needed to "break free" from a gravitational field.
Escape Velocity

An object whose escape velocity is greater than the speed of light
Black Hole

Each planet travels in an elliptical orbit around the sun, and the sun is at one of the focal points.
Keplers 1st law

The line about which circular motion occurs.
Axis of rotation

The time it takes to complete one cycle of revolution or wave oscillation
Period

The product of the force and the lever arm
Torque

One of six types of machines designed to make work easier
Simple Machine

Perpendicular distance from the axis of rotation to a line drawn along the direction of force
Lever Arm

an imaginary line drawn from the sun to any planet sweeps out equal areas in equal time periods
Kepler's 2nd law

An object that revolves around a central body.
Satellite

A device that changes the force needed to do work
Machine

