ࡱ> 7 _ bjbjUU *7|7|, -lTTTh8.JLhF19990000000$@2 `40T959990w1www94T0w90w:we,6T. ʕćh mR9-.10F1S-^44.whhTEACHER NOTES Moments Program Program Problem Answers Left Hand SideRight Hand Side15 x 50 = 5 x 5021 x 10 = 1 x 1032 x 30 = 2 x 30 OR 2 x 30 = 3 x 2045 x 40 = 5 x 40 OR 5 x 40 = 4x 50580 + 80 = 4 x 40 Quiz Answers No.AnswerNotes14(D)Clockwise moments = anti-clockwise moments (definition)21(A)Must be BOTH to produce equilibrium (discuss)32(B)Taking moments about the pivot/fulcrum, W x d = F x b41(A)ADD moments in the same direction53(C)W x 2 = 1 x 600, W = 300 N62(B)Force at B INCREASES as weight moves from left to right73(C)300 x 3 = F x 1, F = 900 N84(D)Work Done = Force x Distance Moved (Definition)91(A)This lever produces a large force though a small distance102(B)SAME, you do not get something for nothing (discuss) Notes The quiz works well if you go round the class asking students individually. If they all find a question difficult, they can vote. Discussion Where in every day life do we meet devices that use moments? See-saw and lever as in the program. Various tools use moments such as scissors, spanner, wheelbarrow and pliers. In the human body the arm is a good example, cranes use a counter-balance weight and balancing scales use a pivot. Moments Worksheet/Homework/Test 1.State the Principle of Moments For equilibrium, the sum of the clockwise moments must equal the sum of the anti-clockwise moments. (Also there must be no resultant forces). 2.If the see-saw is in equilibrium, what is the weight of the child?  W x 2.5 = 1.2 x 650, this gives W = 312 N 3.What is the force F produced by the lever?  250 x 2.9 = 1.1 x F, this gives F = 659.1 N Experiment to Investigate the Principle of Moments Method This experiment is based around using a metre rule with a 2 mm hole drilled through its centre. The apparatus should be set up is as in the program. Plasticene/BlueTack can be used to balance the ruler if necessary before weights are applied. A loop of cotton thread works well as a means of attaching weights to the ruler. The weights and distances are varied (the bigger the range the better) and a graph of the clockwise moments against the anti-clockwise moments should produce a linear graph going through the origin with a gradient of one provided the same scales are used. Alternatively values from the program could be plotted. 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