Physics
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)
Laws of Motion
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Answer
both (a) and (c)
Reason — An athlete often runs before taking a long jump. The reason is that by running he brings his entire body in the state of motion. When the body is in motion, it becomes easier to take a long jump. Hence, it is an example of Newton's first law and inertia of motion.
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Related Questions
A student has four balls - table tennis ball, tennis ball, cricket ball and a football. The correct ascending order of inertia is :
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- cricket ball, football, tennis ball, table tennis ball
- table tennis ball, football, cricket ball, tennis ball
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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.
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
Name the physical quantity which causes motion in a body.