# Can Static Friction Do Work on an Object?

• PsychonautQQ
In summary, static friction is a resistance force that prevents an object from sliding or slipping when a force is applied to it. It does work by opposing the applied force and creating heat due to the friction between two surfaces. The amount of work done by static friction depends on the coefficient of friction, normal force, and distance over which the force is applied. It can also do negative work when the applied force is greater than the maximum amount of force it can provide. The work done by static friction is different from kinetic friction, as static friction prevents motion while kinetic friction acts on an already moving object.
PsychonautQQ

## Homework Statement

My textbook has a true or false problem that says Static Friction can never do work on an Object and they say that it's false.. How can static friction do work?

Consider taking measurements in a moving frame of reference.

Or consider a block resting on a cart (with static friction), and the cart moves.

## What is static friction?

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.

## How does static friction do work?

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.

## What factors affect the amount of work done by static friction?

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.

## Can static friction do negative work?

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.

## How is the work done by static friction different from kinetic friction?

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.

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