Question

Given below are examples of friction shown in List-I with their respective types of friction in List-II.

Which of the following options correctly matches the items of List-I with those in List-II?

• A. (a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)
• B. (a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)
• C. (a)-(i), (b)-(iii), (c)-(iv), (d)-(ii)
• D. (a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)

Hint:

When an object is completely stationary and you try to move it, you are fighting Static Friction. Once it is sliding across a surface, it transitions to Sliding (Kinetic) Friction.

Answer 1

The Correct Option is C

Step 1: Analyzing the Kinematic Interaction for Each Type of Friction:

• (a) Pushing a chair: The flat legs of a chair slide along the floor plane, generating Sliding Friction $\rightarrow$ (i).
• (b) Sea waves: Involves the movement of liquid layers and viscous resistance, which is the definition of Fluid Friction $\rightarrow$ (iii).
• (c) Moving heavy stationary objects: Requires overcoming the maximum threshold of resistive force before any relative motion begins, which is Static Friction $\rightarrow$ (iv).
• (d) Skating: Skates use wheels or smooth blades that roll or slide efficiently. In sports biomechanics curricula, skating wheels are standard examples used to demonstrate Rolling Friction $\rightarrow$ (ii).

Step 2: Matching with Options:
Combining these pairs gives: (a)-(i), (b)-(iii), (c)-(iv), (d)-(ii). This matches option (C).