Q. 64.5( 2 Votes )

The force exerted by the floor of an elevator on the foot of a person standing there is more than the weight of the person if the elevator isA. going up and slowing downB. going up and speeding upC. going down and slowing downD. going down and speeding up

Answer :

In general the normal reaction .

But when the elevator is going up, a pseudo force acts in the down direction, thus we get,

If the elevator is slowing down, , sign of a changes.

If the elevator is speeding up,

Thus, option B is correct.

But when the elevator is going down, a pseudo force acts in the up direction, thus we get,

If the elevator is slowing down, , sign of a changes.

If the elevator is speeding up,

Thus, option C is correct.

option B and C are correct.

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