Static friction is a type of force that acts between two surfaces that are not moving relative to each other. It is a resistance force that prevents an object from sliding or slipping when a force is applied to it.
Static friction does work by opposing the applied force and preventing the object from moving. This work is done in the form of heat energy, as the friction between the two surfaces creates heat due to the molecules rubbing against each other.
The amount of work done by static friction depends on the coefficient of friction between the two surfaces, the normal force pressing the surfaces together, and the distance over which the force is applied. A larger coefficient of friction and normal force will result in more work being done.
Yes, static friction can do negative work. This occurs when the applied force is greater than the maximum amount of force that static friction can provide. In this case, the object will start to move and the friction force will be in the opposite direction of the motion, resulting in negative work being done.
The work done by static friction is different from kinetic friction in that static friction prevents an object from moving, while kinetic friction acts on an object that is already in motion. Additionally, the work done by static friction is always equal to or less than the work done by kinetic friction, as it takes more force to overcome static friction and start the motion of an object.