A car of mass 1,000 kg rounds a level curve of radius 50 m at 10 m s⁻¹. Find the centripetal force needed and the minimum coefficient of friction. Take g = 10 m s⁻².

Explain why a body moving in a circle at constant speed is said to be accelerating.

A body of mass 10 kg is pulled along a rough horizontal surface by a force of 40 N. If the coefficient of kinetic friction is 0.2, find the acceleration. Take g = 10 m s⁻².

A body of mass 2 kg moving at 5 m s⁻¹ is brought to rest in 0.5 s. Find the retarding force and the impulse.

A block of mass 5 kg rests on a horizontal surface whose coefficient of static friction is 0.4. Find the least horizontal force needed to move it. Take g = 10 m s⁻².

Why is the road banked at a curve, and what does the angle of banking depend on?

State the law of conservation of linear momentum and derive it from Newton's third law.