Work, Energy, and Power

Work, Energy, and Power - Work, Power, & Energy Chapter...

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Chapter 4
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Work Definition : the product of force and the amount of displacement in the direction of that force. Mathematically: U = F x d where U = Work [J] F = Force [N] d = displacement [m]
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Work (cont.) In order to determine the amount of work done on an object, we need to know three things: 1. The average force exerted on the object 2. The direction of the force 3. The displacement of the object
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Example A therapist is helping a patient with stretching exercises by pushing on a patient’s foot with an average force of 200-N. The patient resists the force and moves the foot 20-cm toward the therapist. How much work did the therapist do on the patient’s foot during the exercise?
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Energy Definition : the capacity to do work. Forms of energy include heat, light, sound, chemical E, and mechanical E. In biomechanics, we are primarily concerned with mechanical energy
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Energy (cont.) There are two forms of mechanical energy: 1. Kinetic energy (KE) 2. Potential energy
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This note was uploaded on 09/08/2011 for the course ESS 3301 taught by Professor Plumlee during the Spring '10 term at Texas Tech.

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Work, Energy, and Power - Work, Power, & Energy Chapter...

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