They are the lever, the inclined plane, the wedge, the screw, the wheel and axle, and the pulley. When more than one simple machine is put together, it is called a compound machine. This chapter reviews simple and compound machines. Physical Sciences - Electricity and Magnetism Energy is the ability to do work. Energy comes in many forms, including electricity and magnetism.
Electricity is caused by the movement of electric particles in matter.
This chapter reviews electricity and magnetism. The terms conductor, insulator, electromagnet, attract, and repel are included. Physical Sciences - Sound and Light Light and sound are two forms of energy that travel in waves. Light can travel through empty space and through some kinds of matter. Sound can travel through matter but it cannot travel through empty space.