Join ExamsbookAnswer : 1. "greater than the weight of the man"
A man stands in a lift which accelerates upwards. The resultant reaction force on the floor of the lift is5
Q: A man stands in a lift which accelerates upwards. The resultant reaction force on the floor of the lift is
- 1greater than the weight of the mantrue
- 2less than the weight of the manfalse
- 3Same as the weight of the manfalse
- 4Zerofalse
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Answer : 1. "greater than the weight of the man"
Explanation :
Answer: A) greater than the weight of the man Explanation: The weight of the man mg is acting on the floor. As the lift is moving up with an acceleration, say a, the man too in it is having this acceleration. The force producing this acceleration is ma. By Newton's third law, this force will have an equal reaction pressing the floor equal to ma. Therefore the total resultant reaction on the floor is mg+ma = m(g+a) which is mg, the weight of the man. So (a) is correct.
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