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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?
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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.
संबंधित प्रश्न
Which of the following has more inertia:
- a rubber ball and a stone of the same size?
- a bicycle and a train?
- a five-rupees coin and a one-rupee coin?
A body of mass 25 kg has a momentum of 125 kg.m/s. Calculate the velocity of the body.
Describe the term ‘inertia’ with respect to motion.
The inertia of a moving object depends on :
What do you understand by the term inertia?
Multiple Choice Question. Select the correct option.
When you kick a stone, you get hurt. Due to which property this happens?
Passengers lean forward when a sudden brake is applied in a moving vehicle. This can be explained by ________.
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.
What are the types of inertia? Give an example for each type.
A heavy truck and bike are moving with the same kinetic energy. If the mass of the truck is four times that of the bike, then calculate the ratio of their momenta. (Ratio of momenta = 2:1)
