Concept explainers
To explain: The phenomenon due to which a runner will experiencefree fall or apparent weightlessness during steps.
Explanation of Solution
Introduction :
The apparent weight is same as the normal reaction force acting on the foot of runner.
As a runner runs the normal reaction force varies during steps when one foot leave the contact and another is about to make the contact. So at these time normal reaction decreases and hence runner experiences weightlessness.
Conclusion :
Therefore, due to fall in normal reaction force on the feet of runner it experiences weightlessness.
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