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Module 04 - Work and Power 1 Introduction The word work represents a concept that has a special meaning in science that is somewhat different from your everyday concept of the term. In science, the concept of work is concerned with the application of a force to an object and the distance the object moves as a result of the force. Work (W) is defined as the magnitude of the applied force (F) multiplied by the distance (d) through which the force acts, W = Fd.F = mg Figure 1.1 You are doing work when you walk up a stairway since you are lifting yourself through a distance. You are lifting your weight (the force exerted) the vertical height of the stairs (distance through which the force is exerted). Running up the stairs rather than walking is more tiring because you use up your energy at a greater rate when running. The rate at which energy is transformed or the rate at which work is done is called power. Power (P) is defined as work (W) per unit of time (t),P = W t