Give reasons for the following:
The soles of our shoes wear out gradually.

Explanation

**Step-by-Step Text Solution:**

1. **Understanding the Action and Reaction Forces:**
When we walk, we exert a force on the ground through the soles of our shoes. This is known as the action force. According to Newton's third law of motion, for every action, there is an equal and opposite reaction. Therefore, the ground exerts an equal force back on our shoes, which is the reaction force.

2. **Role of Friction:**
As we walk, the soles of our shoes come into contact with the ground, and friction occurs between the two surfaces. Friction is the force that opposes the motion of an object. It is this friction that allows us to walk without slipping.

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