Question

A body of weight 600 N rests on the floor of a lift. If the lift begins to fall freely under the gravity, what is the force with which the body presses on the floor ?

CBSE Class IX Science SA 2 (3 Marks)

Answer 1

When the lift is falling freely under the gravity, the body of weight 600 N kept in it also falls freely under the action of gravity. In this case the reaction (force) of the floor of the lift on the body is zero so the action (force) of the body on the floor of the lift should also be zero. Hence, no force is exerted by the body on the floor of the lift when the lift is falling freely under the gravity. The body is weightless under such situations.