Chapter 3 physical science

# Chapter 3 physical science - Chapter 3 ENERGY Work Work...

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Chapter 3 ENERGY Work Work – when a force is used to move something. There must be motion, AND the motion must be in the direction of the force. Simple Machines A machine is any device that makes work easier. The total amount of work done is not changed, but the force and the distance may change. Example: A lever allows you use a smaller force to do the same amount of work by increasing the distance over which that force is applied. Mechanical Advantage (M.A) – ratio of the effort force (force you put in) on a machine to the resistance force (force you get out). Indicates how much the simple machine multiplies your force. Simple Machines Example: A pulley allows a person to lift a 500 N weight by exerting only 100 N of force. What is the pulley’s M.A.? Example: A nail requires a force of 1000 N to be pried loose of a piece of wood. How much force would you need to apply using a lever with a M.A. of 4? Power

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## This note was uploaded on 04/22/2008 for the course PH 1113 taught by Professor Winter during the Spring '07 term at Mississippi State.

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Chapter 3 physical science - Chapter 3 ENERGY Work Work...

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