Solutions and suspensions are two kinds of mixtures reviewed in this chapter. If substances are combined to form a new substance, a chemical change has occurred. The new substance has different characteristics than the original substances. This chapter reviews the basic elements of chemical change, including the formation of compounds. Physical Sciences - Forms of Energy Energy is the ability to do work.
Energy can exist in different forms, such as kinetic or potential.
It can also originate from various sources. This chapter reviews the kinds and sources of energy. Physical Sciences - Motion and Force Motion is a change in position of an object. Motions are caused by forces. In this section forces, including gravity, buoyancy, magnetism, and friction, and their effects on motion are reviewed.