Problem 3:   A brick of mass m = 0.28 kg is set against a spring with a spring constant of k1 = 627 N/m which has been compressed by a distance of 0.1 m. Some distance in front of it, along a frictionless surface, is another spring with a spring constant of k2 = 103 N/m. The brick is not connected to the first spring and may slide freely.  Part (a)  How far d2, in meters, will the second spring compress when the brick runs into it?  Part (c)  Now assume friction is present on the surface in between the ends of the springs at their equilibrium lengths, and the coefficient of kinetic friction is μk = 0.5. If the distance between the springs is x = 1 m, how far d2, in meters, will the second spring now compress?

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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.