Enter the resisting tension (N), the coefficient of friction, and the angle (rad) into the calculator to determine the Belt Friction Force. 

Belt Friction Force Formula

The following formula is used to calculate the Belt Friction Force.

BF = RT * e ^ (u*b)

  • Where BF is the Belt Friction Force (N)
  • RT is the resisting tension (N) 
  • u is the coefficient of friction 
  • b is the angle (rad) 

How to Calculate Belt Friction Force?

The following example problems outline how to calculate the Belt Friction Force.

Example Problem #1

  1. First, determine the resisting tension (N). In this example, the resisting tension (N) is given as 200 .
  2. Next, determine the coefficient of friction. For this problem, the coefficient of friction is given as  .35 .
  3. Next, determine the angle (rad). In this case, the angle (rad) is found to be 1.2.
  4. Finally, calculate the Belt Friction Force using the formula above: 

BF = RT * e ^ (u*b)

Inserting the values from above yields: 

BF = 200 * e ^ (.35*1.2) = 304.392 (N)


Example Problem #2

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

resisting tension (N) = 432

coefficient of friction = .6

angle (rad) = 2

Entering these given values and solving gives: 

BF = 432 * e ^ (.6*2) = 1434.29 (N)