Assertion `:-` When a man climbs the rope friction force acts in downward direction.
Reason `:-` Friction force opposes relative motion ot tendency of relative motion between two contact surfaces.

Options

A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.
B. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertiion.
C. If Assertion is True but the Reason is False.
D. If both Assertion & Reason are False

Answer

To analyze the given assertion and reason, let's break it down step by step:

### Step 1: Understand the Assertion
The assertion states that "when a man climbs the rope, the friction force acts in the downward direction."

### Step 2: Analyze the Situation
When a man climbs a rope, he exerts a force on the rope to pull himself upward. The forces acting on the man include:
- The gravitational force (weight) acting downward, which is equal to \( mg \) (where \( m \) is the mass of the man and \( g \) is the acceleration due to gravity).
- The frictional force between the man's hands and the rope, which acts to oppose the relative motion.

### Step 3: Determine the Direction of the Friction Force
According to the principles of friction:
- Friction opposes the relative motion or the tendency of relative motion between two surfaces in contact.
- Since the man is climbing up, he has a tendency to slip down due to gravity. Therefore, the frictional force must act upward to prevent this slipping.

### Step 4: Conclusion about the Assertion
The assertion that the friction force acts in the downward direction is incorrect. The friction force actually acts in the upward direction to oppose the downward motion caused by gravity.

### Step 5: Understand the Reason
The reason states that "friction force opposes relative motion or tendency of relative motion between two contact surfaces." This statement is true and aligns with the definition of friction.

### Step 6: Final Evaluation
- The assertion is **false** because the friction force acts upward, not downward.
- The reason is **true** because it correctly describes the nature of friction.

### Final Answer
Thus, the correct conclusion is that the assertion is false and the reason is true.