Define centripetal and centrifugal forces. Explain with the help of neat diagram, how banking provides the centripetal force necessary for a car to go in circular track. (ignore friction between types and road).

What provides the centripetal force in the following cases car taking a turn?

What provides the centripetal force to a caar taking turn on a level road?

Explain why a centrifugal force is not a reaction of centripetal force.

A stone tied to one end of string is moved in a circle. How much work is done by the centripetal force in this circular motion ?

Calculate the speed with which a vehicle can safely move on a banked circular road. How can wear and tear of tyres be reduced on such a road? (taking into consideration the friction between tyres and road).

A train runs along an unbanked circular track of radius 30 m at a speed of 54 km//h . The mass of the train is 10^6 kg . What provides the centripetal force required for this purpose — Hie engine or the rails ? What is the angle of banking required to prevent wearing out of the rail ?

When brakes are applied in a car,the brake-shoes apply frictional force on the wheels.these forces are internal for the system(car).For retardation,external forces ust act on the system.The force of friction at the road surface remains the same before and after teh brakes are applied (f = mu N) .How does the car stop?

On complete combustion a litre of petrol gives off heat equivalent to 3 xx 10^7 J . In a test drive a car weighing 1200 kg, including the mass of driver, runs 15 km per litre while moving with a uniform speed on a straight track. Assuming tha friction offered by the road surface and air to be uniform, calcuate the force of friciton acting on the car during the test drive, if the efficiency of the car engine were 0.5.