13-9. The crate has a mass of 80 kg and is being towed by

Chapter 13, Problem 13-9

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QUESTION:

13-9. The crate has a mass of 80 kg and is being towed by a chain which is always directed at 20 from the horizontal as shown. If the magnitude of P is increased until the crate begins to slide, determine the crates initial acceleration if the coefficient of static friction is /xv = 0.5 and the coefficient of kinetic friction is fik = 0.3.

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QUESTION:

13-9. The crate has a mass of 80 kg and is being towed by a chain which is always directed at 20 from the horizontal as shown. If the magnitude of P is increased until the crate begins to slide, determine the crates initial acceleration if the coefficient of static friction is /xv = 0.5 and the coefficient of kinetic friction is fik = 0.3.

ANSWER:


Using the equation of static friction:
F_s = u_s *N

N = m*g = 80 kg * 9.81 m/s^2 = 786

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