Consider an object on an incline where friction is present. The angle between the incline and the horizontal is θ and the coefficient of kinetic friction is μk.   a. Find an expression for the acceleration of this object. Treat down the incline as the positive direction.  b. Calculate the acceleration, in meters per second squared, of this object if θ = 33° and μk = 0.29. Treat down the incline as the positive direction.

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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.