Friction Calculator
🧱 Forces & Newton’s laws. Use the Friction formula to find friction force, coefficient μ, normal force: pick the value you want, type the others, and the answer updates as you go.
At rest friction can be anything up to μs·N; sliding, it is μk·N.
Pick the ○ next to the value you want to find, fill in the others, and it solves as you type.
What each letter means
| Quantity | Unit |
|---|---|
| Friction force | N |
| Coefficient μ | no unit |
| Normal force | N |
Worked example
Find the friction force when Coefficient μ = 0.3, Normal force = 98.1 N.
Using Ff = μ N: Friction force = 29.43 N.
Frequently asked questions
What is the formula for Friction?
Ff = μ N. At rest friction can be anything up to μs·N; sliding, it is μk·N.
What do the letters stand for, and what units are used?
Friction force in N, Coefficient μ, Normal force in N.
How do you calculate friction force?
Put the values into Ff = μ N. For example, with Coefficient μ = 0.3, Normal force = 98.1 N, friction force = 29.43 N.
Can I solve for a different value?
Yes. In the calculator above, pick the circle next to any value (friction force, coefficient μ, normal force) and fill in the others: it rearranges the formula for you.
