Friction

An object of mass m begins to move on the plane inclined at an angle θ. The coefficient of static friction of inclined surfaces is µ_s. The maximum static friction experienced by the mass is ______

Explain various types of friction.

Suggest a few methods to reduce friction.

State the empirical laws of static and kinetic friction.

A long stick rests on the surface. A person standing 10 m away from the stick. With what minimum speed an object of mass 0.5 kg should he has thrown so that it hits the stick. (Assume the coefficient of kinetic friction is 0.7).

People often say “For every action, there is an equivalent opposite reaction”. Here they meant ‘action of a human’. Is it correct to apply Newton’s third law to human actions? What is mean by ‘action’ in Newton's third law? Give your arguments based on Newton’s laws.

Two masses m₁ and m₂ are connected with a string passing over a frictionless pulley fixed at the comer of the table as shown in the figure. The coefficient of static friction of mass m₁ with the table is µ_s Calculate the minimum mass m₃ that may be placed on m₁ to prevent it from sliding. Check if m₁ = 15 kg, m₂ = 10 kg, m₃ = 25 and µ_s = 0.2.

Briefly explain ‘rolling friction.'