What is (i) dry friction and (ii) fluid friction ?

Explanation

### Step-by-Step Solution:

**Step 1: Define Dry Friction**
- Dry friction is the force of friction that occurs between two solid surfaces in contact with each other. It arises when there is no lubrication or fluid present between the surfaces.

**Example:**
Consider a block resting on a table. The frictional force that opposes the motion of the block when a force is applied is an example of dry friction.

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