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Physics II workshop_Part_32

# Physics II workshop_Part_32 - Testing Newtons Second LawCan...

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66 Testing Newton’s Second Law—Can We Neglect Friction? Earlier we looked at the modified Atwood’s machine, shown to the right, to get some qualitative feel for Newton’s Second Law. We analyzed this for the case of no friction, an ideal string, and an ideal pulley. Real systems have friction, and we must decide experimentally whether friction plays a significant role. Theory: Find the acceleration of the system including a constant frictional force, f = μ m 1 g . Be prepared to turn in your analysis at the start of the period. [Start from free body diagrams and Newton’s Second Law. Do not try to patch up an equation obtained for no friction!] The result you should obtain is a = m 2 g m 1 + m 2 ( ) μ m 1 g m 1 + m 2 ( ) . Experiment: Your task is to check the validity of the analysis, and to determine whether friction must be included or not. Based on your measurements you will either be able to say that friction is unimportant within the uncertainties of your experiment, or that it is important and find the coefficient of friction. Along the

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Physics II workshop_Part_32 - Testing Newtons Second LawCan...

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