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PS 14.3 (review 14.2)
Transcript of PS 14.3 (review 14.2)
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
bring book & vocab lists to class tomorrow!