Question

what happens when brakes are applied to a car moving with a constant velocity?

• A. The passengers tend to lean forward
• B. The passengers tend to lean backwards
• C. The velocity of the car increases.
• D. The velocity of the car decreases.

Answer 1

Answer: (A), (D)

The correct options are
A

The passengers tend to lean forward

D

The velocity of the car decreases.

When a moving car stops suddenly, passenger tends to lean forward.

When the car is in motion, the passengers of the car are also in the state of motion. Now, when the brakes are applied the velocity of the car decreases. At the same time, the velocity of the lower portion of the passenger's body that is in contact with the car decreases at the same rate as the car, dut to the frictional force between the body and the car, and the force applied on the legs. But, the frictional force does not act on the upper half of the body, so it leans forward.