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133_Physics ProblemsTechnical Physics

# 133_Physics ProblemsTechnical Physics - Chapter 5 P5.38 If...

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Chapter 5 135 P5.38 If all the weight is on the rear wheels, (a) F ma mg ma s = = : µ But x at gt s = = 2 2 2 2 μ so µ s x gt = 2 2 : µ s = = 2 0 250 1 609 9 80 4 96 3 34 2 . . . . mi m mi m s s 2 a fb g e j a f . (b) Time would increase, as the wheels would skid and only kinetic friction would act; or perhaps the car would flip over. *P5.39 (a) The person pushes backward on the floor. The floor pushes forward on the person with a force of friction. This is the only horizontal force on the person. If the person’s shoe is on the point of slipping the static friction force has its maximum value. F ma f n ma F ma n mg ma mg a g x x v t a t t t x x s x y y x s x s f i xi x = = = = = = = = = = + + = + +
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