# Understanding Physics: Key Concepts and Definitions

Classified in Physics

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## Henry Cavendish

conducted an experiment that determined the value of the constant...

## Rev of Heavenly Spheres

written by Copernicus in which he proposed that earth and the other planets orbit the sun in perfect circles

## Axis of Rotation

the line about which the rotation occurs

## Tycho Brahe

made precise observation of the planets and stars

## Gravitational Force

the mutual force of attraction between particles of matter

## Centripetal Force

the net force of an object in uniform circular motion

## Uniform Circular Motion

an object that revolves about a single axis and has a constant tangential speed

## Inertial Mass

the property of an object to resist acceleration

## Centrifugal Force

an apparent force that "pushes" away from center

## Apparent Weightlessness

this phenomenon occurs when there is no force of support on your body

## Tangential Speed

the speed of an object in circular motion

## Centripetal Acceleration

the acceleration directed toward the center of a circular path

## Weight

a quantity defined as the product of the mass

## Lever Arm

the perpendicular distance from the axis of rotation to a line drawn along the direction of the force

## Kepler

three laws of planetary motion

## Torque

a quantity that measures the ability of a force to rotate an object around some axis