Assertion: Magnitude of the contact force is always greater than the magnitude of frictional force.
Reason: Contact force is the resultant of the friction force and normal reaction.

Options

A. If both assertion `&` Reason are True `&` the Reason is a corrrect explanation of the Asserion.
B. If both Assertion `&` Reason are True but Reason is not correct explanation of the Assertion.
C. If Assertion is Trie but the Reason is False.
D. If both Assertion `&` Reason are false

Explanation

To analyze the given assertion and reason, we can break down the concepts involved step by step.

### Step 1: Understanding the Assertion
The assertion states that the magnitude of the contact force is always greater than the magnitude of the frictional force.

### Step 2: Understanding the Reason
The reason provided states that the contact force is the resultant of the frictional force and the normal reaction force.

### Step 3: Defining Contact Force
Contact force (F_c) is the total force exerted by two objects in contact. It can be represented as:
\[ F_c = \sqrt{F_{friction}^2 + F_{normal}^2} \]
where:
- \( F_{friction} \) is the frictional force,
- \( F_{normal} \) is the normal reaction force.

### Step 4: Analyzing the Relationship
From the equation \( F_c = \sqrt{F_{friction}^2 + F_{normal}^2} \), we can see that:
- The contact force is a resultant vector that combines both the frictional force and the normal force.
- Since both \( F_{friction} \) and \( F_{normal} \) are positive quantities (in most practical scenarios), it follows that:
\[ F_c > F_{friction} \]
This confirms that the magnitude of the contact force is indeed greater than the magnitude of the frictional force.

### Step 5: Conclusion
Both the assertion and the reason are true, and the reason correctly explains the assertion. Therefore, we conclude that the assertion is true and the reason is a correct explanation of the assertion.

### Final Answer
- Assertion: True
- Reason: True
- Explanation: The contact force is the resultant of the frictional force and the normal reaction force, which confirms that the contact force is always greater than the frictional force.