A boy puts a heavy box of mass M on his head and jumps from the top of a multi-storied building to the ground. What is the force exerted by the box on the boy's head during his free fall? Does the force greatly increase during the period he balances himself after striking the ground?
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3
Answer:
gravitational froce because it is exerted form earth that pulls evrything to ground
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The force exerted by the box on the boy's head is 0
Yes, the force increases greatly during the time he balances himself after hitting the ground due to the weight of the box.
Explanation:
During free fall:
When the boy jumps from the building, the acceleration of boy as well as the box become g (acceleration due to gravity). Hence,the net force is exerted by the earth and none of them exert any contact force.
Acceleration of the boy = acceleration of mass M = g
Mass acceleration with respect to the boy, a = 0
Therefore, the force exerted by the box on the boy's head = M a = 0
Yes, the force increases greatly during the time he balances himself after hitting the ground due to the weight of the box.
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