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. Physical Sciences - Measuring Work and Force Work occurs when a force causes an object to move.
Force is measured in newtons.
Work and energy are measured in joules. Simple machines such as the wheel and the lever make work easier. This chapter reviews the measurement of work and force and the use of machines to make work easier. Physical Sciences - Heat and Matter Heat is the flow of energy from warmer objects to cooler objects. Heat can be transferred by conduction, convection, or radiation.