Static friction in rotational motion is a force that acts between two surfaces in contact when there is no relative motion between them. It prevents objects from sliding or slipping when a force is applied.
Static friction occurs when there is no relative motion between two surfaces, while kinetic friction occurs when there is relative motion between two surfaces. In rotational motion, static friction prevents objects from slipping while kinetic friction is responsible for slowing down or stopping the motion of objects.
The magnitude of static friction in rotational motion depends on the coefficient of static friction, the normal force between the two surfaces, and the surface characteristics of the materials in contact.
Yes, the direction of static friction can change depending on the direction of the applied force. It always acts in a direction that opposes the motion or potential motion between two surfaces.
The formula for calculating static friction in rotational motion is F = μsN, where F is the static friction force, μs is the coefficient of static friction, and N is the normal force between the two surfaces.