4 TYPES OF PLANETARY MOTION

Use your textbook to define the following words

Rotation-

Revolution-

Gravity-

Inertia-

Rotation- when an object spins on its axis, it causes day & night

Revolution- When an object goes around another object, to orbit, one trip around the sun is a year on that planet

Gravity- a force that pulls objects together, the mass and distance between objects affects its strength, it holds solar sys. and galaxies together

Inertia- an objects resistance to change in its speed or direction, a planets forward motion, when balanced with gravity it keeps planets orbiting, if not balanced the planet will travel off into space