Normal Force Calculator
Works out how hard a surface pushes back.
Normal force
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Weight —
Weight along the slope —
Reading this —
The formula
N = m g cos θ + extra force
The normal force balances whatever presses the object into the surface, at right angles to it.
What to watch out for
Friction limits are worked out from this force, so it is usually the first step on a slope.
Frequently Asked Questions
Is normal force always equal to weight?
Only on flat ground with nothing else pressing. A 10 kg mass has a normal force of 98.07 N on the flat and 84.93 N on a 30° slope.
Why “normal”?
In geometry, normal means at right angles. The force acts at right angles to the surface.