Kinetic Friction Calculator
Friction force and deceleration on a surface.
Enter your values
ⓘ Live results
Results
- Friction force
- 147.2 N
- Normal force
- 490.5 N
- Deceleration
- 2.94 m/s²
Quick answer
Friction force = coefficient of friction x normal force.
Ff = mu x N
How to use the Kinetic Friction Calculator
- 1Enter the mass of the sliding object.
- 2Enter the coefficient of kinetic friction for the surface pair.
- 3Add a slope angle if the surface is inclined.
Worked example
Using the values the calculator loads with:
Inputs
- Mass50 kg
- Coefficient of friction0.3
- Surface angle0 degrees
Results
- Friction force147.2 N
- Normal force490.5 N
- Deceleration2.94 m/s²
Frequently asked questions
Where do I find the friction coefficient?
Standard tables give typical values, e.g. rubber on dry concrete is about 0.6-0.8.
Static vs kinetic friction?
Static friction (higher) resists starting motion; kinetic friction applies once sliding.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.