The law of the conservation of energy is one of the great truths of physics. All machines are combinations of simple machines. A machine eases the work performed by either changing the magnitude or direction of the force exerted. The six simple machines are the lever, pulley, wheel and axle, inclined plane, wedge, and screw. Work and Power Work is defined as the product of force exerted on an object and the distance the object moves.
Power is the rate of doing work.
Work is done only if the object is moved. Heat Measurements Heat is the transfer of energy. The properties of heat can be described by the Laws of Thermodynamics. Thermodynamics is the study of the relationships between heat and other forms of energy. Heat always flows from a warmer body to a cooler body.