The term 'brake' may be defined as a device to apply artificial frictional resistance,to a moving body,in order to retard or stop it. In a moving vehicle,the brake are applied either on the pair of rear wheels,front wheels or on both pairs of the front and rear wheels.Now we shall discuss the braking of a vehicle in all the cases one by one.
1.Braking on rear pair of wheels only.It is a common way of braking the vehicle,in which friction force acts in the rear pair of wheels only.
2.Braking on front pair of wheels only.It is a very way of braking the vehicle,in which the frictional force acts in the front pair of wheels only.
3.Braking on both the pair of wheels.It is the most common way of breaking the vehicle,in which the frictional force acts on both the rear and front pair of wheels.
In all the above mentioned three types of braking,the frictional force acts in the backward direction(i.e.,opposite to the tractive force or direction of motion of the vehicle).A little consideration will show,that the breaking distance(i.e.,distance in which the vehicle is brought to rest after the application of brakes)will be the least when the brakes are applied on both the pair of wheels.it is due to this reason that the breaks are applied on both the pairs of wheels(or sometimes termed as all the four wheels of a four-wheeled vehicle) these days.such vehicles are generally used in hilly areas or army operations.
1.Braking on rear pair of wheels only.It is a common way of braking the vehicle,in which friction force acts in the rear pair of wheels only.
2.Braking on front pair of wheels only.It is a very way of braking the vehicle,in which the frictional force acts in the front pair of wheels only.
3.Braking on both the pair of wheels.It is the most common way of breaking the vehicle,in which the frictional force acts on both the rear and front pair of wheels.
In all the above mentioned three types of braking,the frictional force acts in the backward direction(i.e.,opposite to the tractive force or direction of motion of the vehicle).A little consideration will show,that the breaking distance(i.e.,distance in which the vehicle is brought to rest after the application of brakes)will be the least when the brakes are applied on both the pair of wheels.it is due to this reason that the breaks are applied on both the pairs of wheels(or sometimes termed as all the four wheels of a four-wheeled vehicle) these days.such vehicles are generally used in hilly areas or army operations.
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