In the figure provided, there is a crate of mass 4.87 kg on top of another crate of mass 2.66 kg. The coefficient of friction between the lower crate and the floor is μk = 0.350 and the coefficient of static friction between the two crates is μs = 0.880. If the crates start at rest and a force is applied to the right so that both move a distance of 7.48 m, what is the minimal amount of time required in which this can be accomplished without the top crate sliding on the lower crate?

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Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.