TO DO Waves, which exist in mechanical and electromagnetic forms, have various properties. Waves move at different speeds in different materials.
Forces affect motion in a variety of ways.
A. Newton's Laws not addressed at this grade level. B. Gravitational Force and Motion 1. The sun's gravitational pull holds the earth and other planets in their orbits, just as the planets' gravitational pull keeps their moons in orbit around them. Demonstrate with a string and a weighted object. The gravitational pull on an object is the object's weight.