The friction force calculators below account for several different physical situations. Find the situation that fits your problem best before you proceed.
To use the calculator, press “run” and enter your given values. Be sure that you enter your values in the units specified by the calculator. All calculators use proper SI units. For large numbers, you can use scientific notation input. For example, if you wish to enter $3.5 \times 10^{12}$, you would type: 3.5E12. Likewise, for a small number such as $2.2 \times 10^{-19}$, you would type: 2.2E-19.
Static Friction
The two calculators below will calculate the maximum static friction force 
.
Flat Surface
This calculator works when the only forces acting in the vertical direction are 
and 
. If any other forces or components are acting in this direction, this calculator will produce inaccurate results.
For example, use this calculator for a box sitting on a flat surface.
Inclined Surface (Ramp)
This calculator works when an object is at rest on a ramp. You will need to enter then angle of inclination 
as well as the coefficient of static friction 
and the mass of the object 
.
Kinetic Friction
The two calculators below will calculate the kinetic friction force 
.
Flat Surface
Use this calculator when an object is sliding across a flat surface. and should be the only forces acting in the vertical direction. You will need to enter the mass, 
, of the object as well as the coefficient of kinetic friction 
Inclined Surface (Ramp)
Use this calculator when an object is sliding down a ramp. You will need to enter then angle of inclination as well as the coefficient of kinetic friction 
and the mass of the object .
Check out some of our other Physics Calculators here!
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