74_Physics ProblemsTechnical Physics

74_Physics ProblemsTechnical Physics - Chapter 3*P3.63(a 75...

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Chapter 3 75 *P3.63 (a) Let T represent the force exerted by each child. The x - component of the resultant force is TT T T T T cos cos cos . . 0 120 240 1 05 0 = + + = a f af . The y -component is T sin sin sin . . 0 120 240 0 0 866 0 866 0 ++= + = . Thus, F = 0. FIG. P3.63 (b) If the total force is not zero, it must point in some direction. When each child moves one space clockwise, the total must turn clockwise by that angle, 360 ° N . Since each child exerts the same force, the new situation is identical to the old and the net force on the tire must still
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