Enter the normal force (N), the coefficient of friction, and the distance (m) into the calculator to determine the Work Done By Friction.

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## Work Done By Friction Formula

The following formula is used to calculate the Work Done By Friction.

**Wf = NF * u * D**

- Where Wf is the Work Done By Friction (N-m)
- NF is the normal force (N)
- u is the coefficient of friction
- D is the distance (m)

## How to Calculate Work Done By Friction?

The following example problems outline how to calculate the Work Done By Friction.

**Example Problem #1**

- First, determine the normal force (N). In this example, the normal force (N) is given as 150 .
- Next, determine the coefficient of friction. For this problem, the coefficient of friction is given as .75 .
- Next, determine the distance (m). In this case, the distance (m) is found to be 30.
- Finally, calculate the Work Done By Friction using the formula above:

Wf = NF * u * D** **

Inserting the values from above and solving yields:

Wf = 150 * .75 * 30 = 3375 N-m

**Example Problem #2**

Using the same method as above, determine the variables required by the equation. For this example problem, these are provided as:

normal force (N) = 140

coefficient of friction = .85

distance (m) = 15

Enter these given values yields:

Wf =140 * .85 * 15 = 1785** **(N-m)