Friction and Coefficient of Friction Calculator
Works with the standard model of dry friction.
Answer
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Share sends a link that reopens these numbers. Copy details pastes the full breakdown as a list.
Friction force —
Coefficient of friction (μ) —
Normal force —
Slope at which it starts to slide — °
Reading this —
The formula
F = μ × N
μ is the coefficient of friction and N the normal force. Contact area does not appear in this simple model.
What to watch out for
To measure a coefficient, pull an object at steady speed and divide the pull by the normal force, or raise a slope until it slips and take the tangent of the angle.
Frequently Asked Questions
How do I find the coefficient of friction?
Divide friction by normal force. 49 N against 98 N is 0.5.
Can μ be more than 1?
Yes. Soft rubber and some adhesive surfaces exceed 1. It just means friction can exceed the normal force.