Question

Look at the given figure and answer the following question:

If the box just starts moving, what type of friction is acting on the box?

Answer 1

1. The frictional force is a contact force that acts between two surfaces in contact.
2. On a microscopic level, even a smooth-looking surface has irregularities.
3. When an object is placed over another object these irregularities get interlocked and oppose the motion.
4. The friction force comes into play when the object just starts moving from its state of the rest is called static friction.

Hence the type of friction when the box just starts moving is called static friction.