Chapter 8 Rotational Equilibrium and Dynamics

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Presentation transcript:

Chapter 8 Rotational Equilibrium and Dynamics pgs. 277 - 304

Objectives Explain how machines make work easier. Calculate mechanical advantage of machines.

Simple Machines A machine is any device that transmits or modifies force Six types of simple machines: Lever Pulley Wheel and Axle Wedge Inclined Plane Screw

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Mechanical Advantage (MA) Output Force Fout = = Input Force Fin MA

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Efficiency (eff) Efficiency of an ideal machine (no energy lost to friction) is 1 or 100% efficient Efficiency of real machines is always less than 1

A person lifts a 850 N box by pushing it up an incline A person lifts a 850 N box by pushing it up an incline. If the person exerts a force of 325 N along the incline, what is the mechanical advantage of the incline?

The efficiency of a squeaky pulley system is 0. 85, or 85% The efficiency of a squeaky pulley system is 0.85, or 85%. What force is exerted on the machine if a rope is pulled 18.0 m in order to raise a 60. kg mass a height of 3.5 m?