Why do athletes and mountaineers have spikes on the soles of their shoes?

Explanation

**Step-by-Step Solution:**

1. **Understanding the Purpose of Spikes:**
Athletes and mountaineers wear shoes with spikes on the soles primarily to enhance their grip on various surfaces.

2. **Role of Friction:**
Friction is the force that opposes the relative motion of two surfaces in contact. When the friction between the shoe and the ground is increased, it helps in providing better traction.

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