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(A) : The viscous force, air resistance ...

(A) : The viscous force, air resistance etc., are examples of contact force
(R) : Contact force on an object arises due to contact with some other object

A

Both (A) and (R) are true and (R) is the correct explanation of (A)

B

Both (A) and (R) are true and (R) is not the

C

(A) is true but ( R) is false

D

Both (A) and (R ) are false

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze the assertion (A) and the reason (R) provided: **Assertion (A)**: The viscous force, air resistance, etc., are examples of contact forces. **Reason (R)**: Contact force on an object arises due to contact with some other object. ### Step-by-Step Solution: 1. **Understanding Contact Forces**: - Contact forces are forces that arise when two objects are in physical contact with each other. Examples include friction, tension, normal force, air resistance, and viscous force. 2. **Analyzing the Assertion (A)**: - The assertion states that viscous force and air resistance are examples of contact forces. - Viscous force occurs when layers of fluid are in contact and moving relative to each other. Thus, it is indeed a contact force. - Air resistance (or drag) occurs when an object moves through air, and the air molecules exert a force on the object due to contact. Therefore, air resistance is also a contact force. - Conclusion: The assertion (A) is **true**. 3. **Analyzing the Reason (R)**: - The reason states that contact force on an object arises due to contact with some other object. - This definition aligns perfectly with the concept of contact forces, as they are defined by the interaction between two bodies in contact. - Conclusion: The reason (R) is also **true**. 4. **Determining the Relationship**: - Since both the assertion (A) and the reason (R) are true, we need to check if R is the correct explanation of A. - The reason explains why viscous force and air resistance are classified as contact forces, as they arise from the interaction of objects in contact. - Conclusion: R is indeed the correct explanation of A. 5. **Final Conclusion**: - Both assertion (A) and reason (R) are true, and R is the correct explanation of A. Therefore, the correct option is: **Both A and R are true and R is the correct explanation of A**.
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