An adult tries to push a heavy iron safe across a cement floor, but the safe does not move at all. Why does…

An adult tries to push a heavy iron safe across a cement floor, but the safe does not move at all. Why does it stay stationary despite the effort?
  1. Muscular force cannot be applied to metal objects.
  2. Static frictional force between safe and floor balances the applied muscular force.
  3. Gravitational force disappears when a person pushes an object.
  4. Air resistance pushes the safe backward with equal force.

Solution

When the applied force is less than or equal to the maximum static friction, frictional force balances the push, keeping the object stationary.

Asked in: Homi Bhabha Practice

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