Physics
Which one of the following is not an example of inertia of rest?
- When a train suddenly starts moving forward, the passenger standing in the compartment tends to fall backwards.
- When a hanging carpet is beaten with a stick, dust particles start falling out of it.
- On shaking the branches of a tree, the fruits fall down.
- When a passenger jumps out of a moving train, he falls down.
Laws of Motion
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Answer
When a passenger jumps out of a moving train, he falls down.
Reason — When a passenger jumps out of a moving train, he falls down because inside the train, his whole body was in a state of motion. On jumping out of the moving train, as soon as his feet touches the ground, the lower part of the body comes to rest, while the upper part still remains in motion due to inertia of motion and not inertia of rest. Hence, the person falls down.
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Related Questions
A tennis ball and a cricket ball, both are stationary. To start motion in them —
- A less force is required for the cricket ball than for the tennis ball
- A less force is required for the tennis ball than for the cricket ball
- Same force is required for both the balls
- Nothing can be said.
A student has four balls - table tennis ball, tennis ball, cricket ball and a football. The correct ascending order of inertia is :
- table tennis ball, tennis ball, football, cricket ball
- cricket ball, football, tennis ball, table tennis ball
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- football, cricket ball, table tennis ball, tennis ball
An athlete often runs before taking a long jump. This is an example of :
- Newton's first law
- inertia of rest
- inertia of motion
- both (a) and (c)
In inertia of motion, the body continues to be in a state of motion with …………… speed in …………… direction unless an external force is applied.
- variable, zigzag
- same, same
- same, variable
- variable, same