Enter the normal force (N), the coefficient of friction, and the radius (m) into the calculator to determine the Frictional Torque.

## Frictional Torque Formula

The following formula is used to calculate the Frictional Torque.

Tf = N*u*r
• Where Tf is the Frictional Torque (N-m)
• N is the normal force (N)
• u is the coefficient of friction
• r is the radius (m)

To calculate frictional torque, multiply the normal force, coefficient of friction, and radius together.

## How to Calculate Frictional Torque?

The following example problems outline how to calculate the Frictional Torque.

Example Problem #1

1. First, determine the normal force (N). In this example, the normal force (N) is given as 5 .
2. Next, determine the coefficient of friction. For this problem, the coefficient of friction is given as  10 .
3. Next, determine the radius (m). In this case, the radius (m) is found to be 20.
4. Finally, calculate the Frictional Torque using the formula above:

Tf = N*u*r

Inserting the values from above and solving yields:

Tf = 5*10*20 = 1000 (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) = 10

coefficient of friction = 20