Friction Calculator

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Dimensionless. Rubber on dry concrete is about 0.7; steel on ice is about 0.03.
On level ground the normal force equals weight: N = m × g. On a ramp it is N = m·g·cos θ.
Friction forceFriction force
39.23N
Normal force used98.07N
Slip angle (tan⁻¹ μ)21.8°
Friction force39.23
Gravity along slope-
Net (driving) force-

The friction force is about 39.23 N.

  • Friction is the coefficient times the normal force: F = μ·N = 0.4 × 98.07 N.
  • It does not depend on contact area or speed, only on μ and how hard the surfaces are pressed together.

Next stepTo start the object moving, the applied force must exceed this value; once sliding, switch to the kinetic coefficient.

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