Question

The force acting between two surfaces moving over each other is __________.

Answer 1

Frictional force

1. Frictional force is a type of contact force.
2. It starts to act whenever two surfaces are in contact with each other or move or tend to move over one another.
3. It is the force that resists motion when two objects are in contact.
4. Contact forces are those which act when bodies are in direct contact with each other.

Hence, the force acting between two surfaces moving over each other is the frictional force.