A 4.0 kg block is released from rest and slides down an incline as shown in the figure below. (Note: Friction acts only on the portion of the incline shown, μ = 0.25.) 1.0 m 1.0 m Friction 30° Frictionless Surface 000 Frictionless Surface

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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.