Question

Which of the following is true about friction?
a. friction is a force that only occurs on the rough surface. b. friction is a force that occurs only between solids
c. friction can only slow things down
d. friction is a force that only occurs when an object moves​

Answer 1

Answer:

option d is correct answer

Answer 2

The true statement is: a. Friction is a force that only occurs on rough surface.

Explanation:

Friction is a force that resists relative motion of solid surfaces, fluid layers and material elements.

• In ideal situations, smooth surface have zero friction. When any assumptions have to be made regarding zero friction, the surface is considered as smooth.

• Friction do not slow things, in fact it helps in movement of wheels on surface.

• It is not a fundamental force like gravity or electromagnetism.

• Friction exists between objects without any visible relative motion. Ex: book kept on a table. This friction is called static friction. Static friction operates between surfaces that are not moving relative to each other.

• Friction do not exist only between solids. Even in fluids, there is a resistance between moving layers. This resistance is called friction.