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प्रश्न
Why do you fall in the forward direction when a moving bus brakes to a stop and fall backwards when it accelerates from rest?
उत्तर
- Everybody tries to maintain their state of motion or rest. If a body is at rest, it tries to remain at rest. If a body is moving, it tries to remain in motion. In a moving bus, a passenger moves with the bus. As the driver applies brakes, the bus comes to rest. But the passenger tries to maintain his state of motion. As a result, forward force is exerted on him.
- Similarly, the passenger tends to fall backwards when the bus accelerates from rest. This is because when the bus accelerates, the passenger's inertia tends to oppose the bus's forward motion. Hence, the passenger tends to fall backwards when the bus accelerates forward.
APPEARS IN
संबंधित प्रश्न
Name the property of bodies (or objects) to resist a change in their state of rest or of motion.
With which physical quantity should the speed of a running bull be multiplied so as to obtain its momentum ?
On what factor does the inertia of a body depend ? Which has more inertia, a cricket ball or a rubber ball of the same size ?
When a tree is shaken, its fruits and leaves fall down . Why ?
If the mass of a body and the force acting on it are both doubled, what happens to the acceleration ?
What is meant by the term inertia?
Name the factor on which the inertia of a body depends and state how does it depend on the factor stated by you .
Give two examples to show that greater the mass, greater is the inertia of the body.
Explain the following:
Why do fruits fall off the branches in the strong wind?
Assertion & Reasoning
- Assertion: The value of ‘g’ decreases as height and depth increase from the surface of the Earth.
- Reason: ‘g’ depends on the mass of the object and the Earth.
