Define friction. Prove that tangent of angle of friction is equal to coefficient
of friction.

Explained below

Explanation:

- Friction is the force that opposes the motion between two or more objects/surfaces in contact with each other.

- On an inclined plane, the coefficient of static friction is given by the relation;

μ = F_max/F_n

Where;

F_max is maximum frictional force before slip = mg sin θ

F_n is normal force = mg cos θ

Thus;

μ = mg sin θ/mg cos θ

μ = tan θ

thermal energy is the answer

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