Question

Alida runs her toy car on the dry marble floor. wet marble floor, newspaper, and towels spread on the floor. The force of friction acting on the car on different surfaces on wet and dry marble floors. newspaper and towel in ascending order will be

• A. wet marble floor, dry marble floor, newspaper, and towel
• B. newspaper and towel wet marble floor, dry marble floor.
• C. towel wet marble floor, dry marble floor. newspaper
• D. wet marble floor, newspaper , towel , and dry marble floor.

Answer 1

The correct option is A

wet marble floor, dry marble floor, newspaper, and towel

Explanation of correct option

(A) - wet marble floor, dry marble floor, newspaper, and towel

1. Friction: The force that opposes the relative motion between two surfaces of objects when they come in contact. Frictional force always acts in a direction opposite to the direction of applied force.
2. Nature of the surface affects the force of friction.
3. Wet floor is more smooth than a dry marble floor and a newspaper.
4. So the force of friction is rough surface is more than a smooth surface.
5. The friction between the surface of a toy car and a towel is more than compared to a newspaper because the surface of the towel is rough.
6. If the surface is rough, more is friction between the surfaces in contact and vice-versa.
7. The force of friction on wet marble floors is the least due to the presence of a layer of water which makes the surface of marble smooth.
8. Roughness present in the given surfaces can be arranged in ascending order as wet marble floor, dry marble floor, newspaper, and towel.

So option A is correct for ascending order.