Question

Rahul has to pull a block of solid wood. The static friction between its surface and the floor is 30N. Now he puts two rollers between the surface of the block and the floor, the rolling friction between these two surfaces should most likely be
A) 30N
B) 40N
C) 10N
D) 50N

Answer 1

i think 10 newton is the answer. The answer as i have solved.

Answer 2

Answer:

The correct option is C) 10N.

Explanation:

• The force that opposes an object's motion on the surface it is in touch with is known as friction.

1. Static friction: Static friction occurs when one body tries to move on the surface of another body but the actual motion has not yet begun.
2. Kinetic friction: Kinetic friction is the opposing force that is present when a body is moving on another body's surface.

• Rolling friction is a sort of kinetic friction that occurs when one body rolls on the surface of another.
• Modern theory holds that the interatomic force of attraction between a body's surface and the surface of another body at the point of contact is what causes friction to occur between two bodies. This is known as cold welding.
• Limiting friction is the strongest opposition provided by the interatomic forces (limiting friction is maximum static friction).
• When the external force exceeds the limiting friction, the interatomic connection breaks and the surface becomes comparably smoother than it was previously.
• As a result, kinetic friction is lower than static friction.
• Since rolling friction is a sort of kinetic friction, it is also less than static friction.
• Therefore, when Rahul puts two rollers between the surface of the block and the floor, the static friction between these two surfaces decreases. Hence the rolling friction most likely is 10N.

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