The horizontal force P = 67 N is applied to the upper block with the system initially stationary. The block masses are ma = 13 kg and mg - 7 kg. Determine the magnitudes of the frictions forces F1 (between block A and the ground) and F2 (between blocks A and B) for the following conditions on the coefficients of static friction: (a) µ1 = 0.40, µ2 = 0.37 and (b) µ1 = 0.26, µ2 = 0.48. Assume that the coefficients of kinetic friction are 71 percent of the static values. 20° Answers: (a) F1- N F2 = i N i (b) F1- N F2- i N

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British Gravitational Bg System Of Units

Measuring is the comparison of a particular physical quantity with its reference value. A unit is a fixed physical quantity. The length is a physical quantity. A physical quantity is the product of a unit and the numerical value we need to compare with.