# What type of energy does friction turn work-energy into?

## What type of energy does friction turn work-energy into?

Thermal energy

Thermal energy from friction Since the friction force is non-conservative, the work done is not stored as potential energy. All the work done by the friction force results in a transfer of energy into thermal energy of the box-floor system.

## What is the formula for work done by friction?

Friction does negative work. Example 10: In Example 9, the work done by force of friction is -112,000J. Use the work formula to calculate the force applied by friction if brakes were used within a distance of 56m. Solution: Using Work formula: W = Fk x ; -112,000J = Fk(56m); Fk =-2000N.

**What is the work-energy theorem formula?**

W net = m v 2 − v 0 2 2 d d . This expression is called the work-energy theorem, and it actually applies in general (even for forces that vary in direction and magnitude), although we have derived it for the special case of a constant force parallel to the displacement.

**Is the work done by kinetic energy equal to friction?**

We apply the work-energy theorem. We know that all the car’s kinetic energy is lost to friction. Therefore, the change in the car’s kinetic energy is equal to the work done by the frictional force of the car’s brakes.

### How is the work done by friction equal to thermal energy?

Thermal energy is due to the two surfaces (i.e Walter’s fur and the ice) rubbing against each other, which is basically friction. So the work done by friction is W-Fk*d (Fk is the force of friction) and it is equal to the thermal energy. I Hope i was clear enough! (5 votes)

### Why is the work done by friction negative?

In this problem, work done by friction will be negative because the force is applied in the opposite direction as the motion, and will decrease the initial energy, giving us a Final Energy result that is less than the initial energy because energy is lost to friction.

**How to calculate the kinetic energy of friction?**

Since friction is always an opposing force you subtract this from the 38.5KJ and get the 8455J mentioned. This is the kinetic energy so 1/2mv^2 and you then multiply both sides by 2 and get 16910 = mv^2. The mass is 90kg so divide both sides by 90 and get v^2=187.8889. Square root this and you end up with 13.7m/s.

**Is the work energy theorem valid with friction?**

This expression holds in general, including in cases of friction. So the work energy theorem is valid, even with friction. However, it does not tell you anything about the flow of energy between objects. Now, the thermodynamic work is more interesting. Suppose that we have a stationary table and we are sliding a rough block across the table.