Question

When a body is moving on a surface, the force of friction is called.
A. Static friction
B. Dynamic friction
C. Limiting friction
D. Rolling friction

Answer 1

Hint: Here we need to know the different types of friction as all the four options in the question contain four types of friction. Also find the specific condition which is applied in each type of friction that is what is the condition for the body means body should be moving or remains at rest with respect to the surface.

Complete step by step solution:
We need to find the friction which is applied when the body is moving on a surface.
Checking each option one by one:

For option A: Static friction
Static friction acts on a body when the body is at rest with respect to the surface.
For option B: Dynamic friction
It is the opposing force which acts on the body which is moving over the surface.
So this matches the given condition in the question. Therefore, it is the right answer.
For 0ption C: Limiting friction
It is the friction which occurs between the two static surfaces in contact.
For 0ption D: Rolling friction
Rolling friction generated on objects when they are rolling over a surface in contact.

Hence, the correct answer is option B.

Note: Dynamic friction by name is known as something that is dynamic or moving. So this friction acts on a moving body that is in contact with each other. All the other options given in the question have friction that applies on a static body hence they cannot be the right answer for the given condition.