JEE Main 2023PhysicsLaws of MotionEasyMCQ

JEE Main 2023 — Laws of Motion Question with Solution

JEE Main 2023 (24 Jan Shift 1)

Question

Given below are two statements:
Statement-I: An elevator can go up or down with uniform speed when its weight is balanced with the tension of its cable.
Statement-II: Force exerted by the floor of an elevator on the foot of a person standing on it is more than his/her weight when the elevator goes down with increasing speed.
In the light of the above statements, choose the correct answer from the options given below:

Choose an option

Show full solutionCorrect option: B
Correct answer
BStatement I is true but Statement II is false

Step-by-step explanation

When elevator is moving with uniform speed T=Fg, as the net force along the vertical direction should be zero.

Therefore, Statement-I is true.

Now, when elevator is going down with increasing speed, its acceleration is downward.
Hence, 

W-N=ma⇒W-N=Wg×a

⇒N=W1-ag

Clearly, normal reaction is less than weight. So Statement-II is false.

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About this question

This is a previous-year question from JEE Main 2023, covering the Laws of Motion chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.