PLANETARY MOTION

Rotation When an object spins on its axis Earth rotates once every 24 hours Gives us day and night

Revolution When an object goes around another

object Earth revolves around the sun once every

365 1/4 days. That is one year.

Orbit The path an object takes around another

object Earth’s orbit is an ellipse.

Inertia

An object in motion will stay in motion unless acted on by a force.

This is why we wear seatbelts. Baseball in space

gravity The force of attraction between two

objects. Affected by mass and distance

Gravity and Inertia Inertia is what keeps the planets moving

in space. Gravity is what keeps them moving

around the sun.