JEE Main Physics question

Physics Systems of Particles and Rotational Motion JEE Main

The centre of mass of a system cannot change its state of motion unless there is an external force acting on it. Yet, in an automobile, the internal force (brakes) can bring the car to rest. Then

(A)The brakes stop the wheels
(B)The friction between the brake pads and the wheel stops the car
(C)The car is stopped by the roadCorrect
(D)The car is stopped by the driver pressing the pedal

Answer: (C)

Solution

The brakes only stop the relative rotation of the wheels; the actual external horizontal force that decelerates the car's centre of

See the full step-by-step solution

Create a free account to read the complete working, and practise questions like this in a timed test.

Create a free account

Question ID VK-158600