Question

Given below are examples of friction shown in List-I with their respective types of friction in List-II.
List-I: (a) Pushing a chair, (b) Sea waves, (c) Moving heavy stationary objects, (d) Skating
List-II: (i) Sliding, (ii) Rolling, (iii) Fluid, (iv) Static

• 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:

Static friction is always the strongest type of friction, while rolling friction is the weakest. This is why it's harder to start moving a heavy box than to keep it sliding.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Friction is the resistance offered by surfaces in contact. Its type depends on whether the object is stationary, sliding, rolling, or moving through a medium like water or air.
Step 2: Detailed Explanation:

1. Pushing a chair (a): The legs of the chair rub against the floor, which is Sliding friction (i).
2. Sea waves (b): This involves movement through water (a liquid), which is Fluid friction (iii).
3. Moving heavy stationary objects (c): The resistance encountered before the object starts moving is Static friction (iv).
4. Skating (d): While ice skating involves a thin film of water, in the context of general "skating" (like roller skates), it is characterized by Rolling friction (ii).
Step 3: Final Answer:
The matching pairs are (a)-(i), (b)-(iii), (c)-(iv), and (d)-(ii).