Question

The effect of frictional force may be minimized by:

• A. using a smooth object
• B. using a smooth plane
• C. providing a lubricant at the surface of contact
• D. All of these

Hint:

Common methods to reduce friction include:

Polishing surfaces
Lubrication
Using ball bearings

Answer 1

The Correct Option is D

Step 1: Understand how friction arises. Friction is caused by the interlocking of irregularities between two surfaces in contact. Step 2: Analyze each method given.

Using a smooth object: reduces surface irregularities → friction decreases
Using a smooth plane: smoother contact → less interlocking
Providing a lubricant: creates a thin layer between surfaces, reducing direct contact
Step 3: Evaluate the options. All the given methods help in reducing friction. Step 4: Final conclusion. The effect of frictional force may be minimized by all of these methods. \[ \boxed{\text{(D)}} \]