Question

To sharpen the blade of a knife by rubbing it against a surface, which of the following will be most suitable?

• A. stone
• B. plastic block
• C. wooden block
• D. glass block

Answer 1

The correct option is A

stone

The explanation for the correct option:

In the case of option A,

Friction force:

1. Friction is the force that prevents one solid object from sliding or rolling over another.
2. Frictional forces, such as the traction required to walk without slipping, are beneficial.
3. Friction forces also provide a significant amount of resistance to motion.

Stone:

1. A stone will be more suitable to sharpen the blade of a knife.
2. It will provide a greater reaction and thus a higher friction force, making it easier to sharpen a knife's blade by rubbing.

The explanation for the incorrect options:

Plastic blocks, wooden blocks, and glass blocks do not provide greater reaction and friction force to sharpen the blade of a knife.

Hence, Option(A) is correct.