What is the difference between mass and matter? Gravity is the force of action between two objects. It’s called a natural force because it acts at a distance rather than needing to be in contact.

If your students like sports, rockets and roller coasters, then they’ll like Sir Isaac Newton! Newton’s Laws will help your students understand force, motion, and the transfer of energy. In this ...

All of the objects in our solar system are acted upon by forces. Forces are pushes or pulls. Every force has both a strength and a direction. Applying a force on something–like pushing a toy car–can ...