A large shipping crate is at rest on the horizontal floor of a warehouse. The coefficient of static friction between the crate and the floor is μs = 0.500; the coefficient of kinetic friction is μk = 0.300. Assume that the estimation of the weight of the heaviest crate you could start sliding by pushing on it horizontally is about 100 lb. a) Based on this estimate, what is the magnitude of the maximum force you can apply? b) If you continue to push on the crate with constants force equal to the force calculated in part a) use the impulse-momentum theorem to calculate how long you must push on the crate to give it a speed of 8.0 m/s. Don't forget to take into account the kinetic friction force.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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A large shipping crate is at rest on the horizontal floor of a warehouse. The coefficient of static friction between the crate and the floor is μs = 0.500; the coefficient of kinetic friction is μk = 0.300. Assume that the estimation of the weight of the heaviest crate you could start sliding by pushing on it horizontally is about 100 lb. a) Based on this estimate, what is the magnitude of the maximum force you can apply? b) If you continue to push on the crate with constants force equal to the force calculated in part a) use the impulse-momentum theorem to calculate how long you must push on the crate to give it a speed of 8.0 m/s. Don't forget to take into account the kinetic friction force. 

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