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CBSE Class 11-science Answered

A woman of mass 50 kg is standing in an elevator. Suddenly the cable of the elevator break and the elevator begin to fall freely .the force exerted by the floor of the elevator on the woman is?

Asked by Ramapadhi148 | 08 Apr, 2019, 06:08: PM
Expert Answer
As the cable breaks suddenly the lift will act as a freely falling body. 
Thus, 
acceleration of lift = acceleration due to gravity 
a = g ...(1)
Thus, a normal reaction by the floor on a woman (N) = Weight of woman - upward force on a woman
N = W - ma = mg - mg = 0 ...(from (1))
 
Thus, net force exerted by the floor of an elevator on a woman is zero. 
Answered by Shiwani Sawant | 08 Apr, 2019, 06:36: PM
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