How do you calculate the work done against friction?

To calculate the work done against friction, you need to know the force of friction and the distance travelled.

When an object moves against a surface, it experiences a force called friction. This force opposes the motion of the object and causes it to slow down. The work done against friction is the energy required to overcome this force and move the object a certain distance.

To calculate the work done against friction, you need to know the force of friction and the distance travelled. The force of friction can be calculated using the equation Ff = μN, where μ is the coefficient of friction and N is the normal force. The normal force is the force exerted by the surface on the object perpendicular to the surface.

Once you have calculated the force of friction, you can use the equation W = Fd to calculate the work done against friction. W is the work done, F is the force of friction, and d is the distance travelled. If the force of friction is constant, you can simply multiply the force by the distance to get the work done.

It is important to note that the work done against friction is always negative. This is because the force of friction opposes the direction of motion, so the work done is always in the opposite direction to the displacement of the object.