When brakes are applied on a moving car, the car dips to the front. Why ? [That is try to show that front wheels are more pressed as compared to rear ones when the brakes are applied]. Assume that centre of mass of the car is equidistant from the front and rear wheels.

A 1000 kg car is travelling at 108 km/h when the brakes are applied. If the car stops in 10 m, find the stopping force .

The rear wheel on a clown's bicycle has twice the radius of the front wheel. (a) When the bicycle is moving, is the linear speed at the very top of the rear wheel greater than, less than, or the same as that of the very top of the front wheel? (b) Is the angular speed of the rear wheel greater than, less than, or the same as that of the front wheel?

Assertion: When brakes are applied on a wet road, a car is likely to skid. Reason: Brakes prevent rotation of the wheels, and there is not sufficient friction between the road and the whells.

Assertion: When brakes are applied on a wet road, a car is likely to skid. Reason: Brakes prevent rotation of the wheels, and there is not sufficient friction between the road and the whells.

Assertion: When brakes are applied on a wet road, a car is likely to skid. Reason: Brakes prevent rotation of the wheels, and there is not sufficient friction between the road and the whells.

What must be the minimum coefficient of friction mu between the tyres of the drive wheels of a car and the road, if the car and the road, if the car of mass m=2 tons and load M=4 tons, has an acceleration a=0.2 ms^(-2) ? Consider the problem for two cases : (a) all the wheels are driven , (b) only the rear wheels are driven. Assume that the centre of gravity of the car lies at the mid-point between the axes of the wheel and the centre of gravity of the load above the rear axle.

The diameter of the front wheel of an engine is 2x cm and what of rear wheel is 2y cm. To cover the same distance, find the number of times the rear wheel will revolve when the front wheel revolves 'n' times.