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Force and Laws of Motion — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceForce and Laws of Motion1 Mark
MCQ
In the following Questions, the Assertion and Reason have be put forward. Read the statements careful and choose the correct alternative from the following:
Assertion: Atheletes fall on a cushion in a high jump event to avoid getting hurt.
Reason: Time to come to rest is increased to reduce the force.
  • A
    Both the Assertion and the Reason a correct and the Reason is the correct explanation of the Assertion.
  • ✓
    The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.
  • C
    Assertion is true but the Reason is false.
  • D
    The statement of the Assertion is false but the Reason is true.
✓

Answer

Correct option: B.
The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.
During Athletics meet, a high jumping athlete is provided either a cushion or heap of sand on the ground to fall upon.
  • This is done to prevent injury to the athlete when he falls down after making a high jump.
  • When he falls on a a soft landing site [either cushion or sand], then the jumper takes a longer time to come to stop.
  • The rate of change of momentum of the athlete is less due to which a smaller force will act on athlete.
  • So, athlete does not get injury and cushion or sand reduces the momentum of athlete's.

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