If a box placed on a floor is pushed, do you think frictional force experienced by the box acts on the entire box or only on the surface of the box touching the floor? Give a reason for your answer.

Explanation

To answer the question, we need to analyze the behavior of friction when a box is pushed on a floor.

### Step-by-Step Solution:

1. **Understanding Friction**: Friction is a force that opposes the relative motion between two surfaces in contact. It arises due to the irregularities on the surfaces at a microscopic level.

2. **Contact Surface**: When a box is placed on the floor, the only area where the box and the floor are in contact is the bottom surface of the box. This contact surface is where the frictional force acts.

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