Mass and Energy

1. kinetic energy
2. two kinds of potential energy are electrical and chemical
3. radioactive energy of light distributed by photons

Speed, velocity, acceleration, and Newton’s laws of movement
Universal law of gravitation, with force diminishing with a square distance
Second Newton’s law: force is equal mass x acceleration. Gravity constant   g = 9.81 m/s2 = 32.2 ft/s2
Gravitation is a force of attraction exerted by each particle or matter on other matter.
Gravity is a force that attracts a body toward the center of earth.