Can static friction ever zero?

For an object at rest on a flat table, static friction is zero. If you push horizontally with a small force, static friction establishes an equal and opposite force that keeps the book at rest. It is harder to move a stationary object than it is to keep a moving object in motion. …

Is there friction in rough surface?

Rough surfaces have more friction than smooth surfaces and liquids such as oil or water are sometimes used as lubricants to reduce the effect of friction. There is no mystery behind friction. It acts on objects at the surfaces so as to prevent or reduce movement between the surfaces.

Is there static friction on a flat surface?

Yes. Friction exists, but does not necessarily exert a force. If an object is at rest on a flat, horizontal surface that is also stationary, there is static friction between the object and the surface.

Is work done by static friction on an object is always zero?

if there is no slip between A and B then f is static and total work done by static friction on system is zero.

Why rough surface has more friction?

Friction is always more on a rough surface compared to a smooth surface. This is because rough surface offers more resistance to the movement of an object over it compared to a smooth surface.

How does friction differ in smooth surface from a rough surface?

Friction is a force that opposes motion between any surfaces that are touching. Friction occurs because no surface is perfectly smooth. Rougher surfaces have more friction between them. Heavier objects also have more friction because they press together with greater force.

Is infinite friction possible?

Infinite friction isn’t required. You just need enough friction combined with enough speed and the related centripetal force to keep the ball rolling and not sliding, even when at the top of the loop.