Q1. What are the laws of friction.

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1. When applied force (P) is less than Limiting Frictional force ( ), body will not move. In this case the value of frictional force is equal to applied force.
2. When applied force (P) is equal to Limiting Frictional force ( ), body will not move. Body will be on the verge of motion called as Impending motion. In this case the value of frictional force is the limiting friction force value.
3. When applied force (P) is greater than Limiting Frictional force ( ), body will move. In this case the value of frictional force is different.

Q2. Explain the concept cone of friction.

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A cone in which the resultant force exerted by one flat horizontal surface on the another is to be located when both the surface are at rest as determined by the coefficient of static friction is called cone of friction.

example 9:three block

example 10

example 11