Main Idea: Matter is composed of parts that are to small to be seen without magnification. Matter can be classified and described as elemnts, compounds, and mixtures. All substances can undergo physical and chemical changes using different forms of energy.
Main Idea: Energy is required to set things in motion. Moving objects can be characterized using concepts such as force, velocity, acceleration, potential energy, and kinetic energy. Sound and light travel as waves, carrying energy to eyes and ears. Sound travels through matter only. Light travels through matter and empty space.