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PS 14.3 (review 14.2)

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by

Brooke Britt

on 23 April 2013

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Transcript of PS 14.3 (review 14.2)

Mechanical Advantage Open book quiz You may use your book and notes to answer the questions
DO NOT TALK
Raise your hand if you have a question
Turn in quiz
14.3 Ideal Mechanical Advantage IMA of a machine is the mechanical advantage in the absence of friction Efficiency Remember, work output is always less than work input
Section 14.3 Assessment Answer questions #1-5 on pg. 426 Review 14.2 Work and Machines pg.417 W=FxD Because of friction, the work done by a machine is always less than the work done on the machine input force: the force you exert on a machine
input distance: the distance the input force acts through the input force working through the input distance is the input work output force: the force exerted by the machine
output distance: the distance the output force is exerted
work output: the output force multiplied by the output distance Let's look at figure 7 on pg. 419 Mechanical Advantage and Efficiency define vocab. words pg.421 of a machine is the number of times that the machine increase an input forces Actual Mechanical Advantage output force input force AMA = Since friction is always present, the AMA of a machine is always less than the IMA IMA = input distance output distance Math Skills pg. 425 #1-3 complete the problems,
we will go over answers So, efficiency is the percentage of the work input that becomes work output Efficiency = work output work input x 100% Reducing friction increases the efficiency of the machine answer in complete sentences
number the questions Homework Read 14.4
define vocabulary
bring book & vocab lists to class tomorrow!
Full transcript