Newton's Second Law

Also known as F = ma · second law of motion · net force equation

F = m a

F =

m =

a =

Enter your known values, leave one input blank, and solves for the missing one. Try different units for next level excitement!

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Newton's second law defines the newton itself: 1 N is the force that accelerates 1 kg at 1 m/s². Weight is just this formula with a = g (9.81 m/s²), which is why your mass is the same on the Moon but your weight is not.

Newton's Second Law

F = m a

Where

$F$ = Force
$m$ = Mass
$a$ = Acceleration

Missing one of these? Work it out first, then come back

Force — Work (W = Fd cos θ), Power from Force and Velocity (P = Fv)
Mass — Density, Kinetic Energy
Acceleration — Final Velocity (Uniform Acceleration), Displacement (Uniform Acceleration)