A person is standing in an elevator. The situation in which he finds his weight less than actual is when : a) the elevator moves upward with constant acceleration b) The elevator moves downward with constant acceleration c) The elevator moves upward with uniform velocity d) The elevator moves downward with uniform velocity justify the reason for the answer

Asked by Arpit Panda | 20th Oct, 2010, 12:00: AM

Expert Answer:

Dear Student
Answer (b). The elevator moves downward with constant acceleration
Reason: Newton's third law of motion.  If a body exerts a force on another, there is an equal and opposite force, called a reaction on the first body by the second. In Downward moving elevator (with a uniform acceleration), the man experiences an upward force. This reduces his weight.
In case of uniform velocity, Force= mas x acceleration is zero since acceleration is zero.
Hope that satisfies your query.

Answered by  | 20th Oct, 2010, 09:47: PM

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