Question

A water tanker filled up to $\frac{2}{3}$ of its height is moving with a uniform speed. On sudden application of the brake, the water in the tank would?

• A. move backward
• B. move forward
• C. be unaffected
• D. rise upwards

Answer 1

The correct option is B

move forward

Applying brakes on the water tanks:

1. Newton's first law of motion states that a body undergoing motion would continue to move if no external force would be applied to it. Because the water throughout the tanker isn't a component of the tanker, whenever we apply the brakes, the water doesn't quite stop because there is no external force upon that.
2. Whenever a tanker seems to be half full with water, the water inside the tanker flows at a similar speed as that of the tanker.
3. If suddenly brakes are applied, the tank decreases its speed but water cannot decrease its speed immediately because of its inertia.
4. The tanker's velocity slows whenever the brake pedal is pressed, but no external force has been acting directly somewhat on the water. As an outcome, the tanker's velocity decreases but the velocity of the water within remains constant.

Therefore, whenever the brakes are applied, the water in the tanker will continue to move forward.

Hence, option B is correct.