SIMPLE MACHINE PROBLEMS I SOLUTIONS 1)The machine is not helpful in lifting large weights because the mechanical advantage is less than 1 (the value is 0.5). In order for a simple machine to be useful, the mechanical advantage must be greater than one because this in effect reduces the input force used to move the load. 2)a)The first diagram shown is a first class lever (since the fulcrum is between the load and the effort). The second diagram is a second class lever (since the load is between the effort and the fulcrum). The last diagram is a third class lever (since the effort is between the load and the fulcrum). b)For the first class lever: ()()()( )FFddFFFoutputinputinputoutputinputinputinput=⇒=−⇒=60 9 881284860 9 8294.. NN . For the second class lever: ()()FFdoutputinputinputoutputinputinputinput=⇒=⇒=60 9 812441260 9 8196.NFor the third class lever: ()()FFdoutputinputinputoutputinputinputinput=⇒=⇒=60 9 841212460 9 81764.
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This note was uploaded on 07/27/2010 for the course MATH MATH 1025 taught by Professor Tanny during the Spring '09 term at York University.