Sample Problem 1 The coefficient of static friction between a person's shoe and the ground is 0.70. Determine the maximum magnitude of acceleration of the 62 kg person, if he starts running on a horizontal surface from rest. Given: μ = 0.70; m = 62 kg s Required: a Analysis: Draw the FBD of the person (Figure 7). FN Figure 7 Fax In this case, the max force since the norm need to calculate F he mace of Foet=FF Solution: Fs = μg. (0. F = 42 Now calculate the m Fnet ma (62 kg) a FS 425 425 a 6.9 = Statement: The maxi 6.9 m/s². Practice 1. Two people start running from rest. The first person has a mass of 59 kg and is wearing dress shoes with a coefficient of static friction of 0.52. The other person is wearing running shoes with a coefficient of static friction of 0.66. (a) Calculate the maximum possible initial acceleration of the person wearing dress shoes. [ans: 5.1 m/s² [forward]] (h) Explain why we do not really need poreon whon finding the initial

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