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the force of gravity on a mass

Period of Revolution

the time it takes a planet to go around the sun once


the feeling of weightlessness

Projectile Motion

when an object moves outward and falls downward at the same time


a force that pulls all objects toward one another

Acceleration Due to Gravity

9.8 m/s2

Centripetal Force

force that keeps an object moving in a circle

Kepler's Law

describes the orbits of planets around the sun


the curved path, usually elliptical, around the sun or a planet

Terminal Velocity

point where air resistance and pull due to gravity balance out on a falling object

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