Act_8 - Name Section Per 8 Activity Sheet Work Efficiency...

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Name ________________________ Section ___________________ Per 8 Activity Sheet: Work, Efficiency, and Complex Machines 8.1 How Much Work is Done by Machines? How Efficient Are They? a) Block and Tackle Your instructor will use the block and tackle to lift blocks. 1) How much weight did the block and tackle lift? _______________ 2) How high off the floor were the cement blocks raised? _______________ 3) Find the work done on the blocks to raise them. This is the work out . ___________ 4) How much force was needed to raise the blocks? _______________ 5) Through what distance was the rope pulled to lift them? ________________ 6) Find the work done when you pull the block and tackle rope. This is the work in . _____________ 7) Calculate the efficiency of the block and tackle. __________ b) Winch Try a “tug of war” game with the winch in the front of the classroom. 1) Suppose you move the handle of the winch in a circle a distance of 112 meters (distance in). When you do, the winch rope moves 2 meters (distance out). If you exert a force of 280 newtons on the winch handle (force in), calculate how much work in must you do to move the winch handle a distance of 112 m. ________________ 2) If the force out on the rope is 8,400 newtons, how much work out does the winch do as it pulls the rope a distance of 2 m? ________________ 3)
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This note was uploaded on 06/11/2011 for the course PHYSICS 103 taught by Professor Staff during the Spring '10 term at Ohio State.

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Act_8 - Name Section Per 8 Activity Sheet Work Efficiency...

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