Force Calculator
Newton's second law, F = ma, worked out for you. Enter any two of force, mass, and acceleration and it fills in the third.
Fill in any two fields and leave the third blank — the calculator solves for the one you left empty using F = m·a.
Force
6N
Mass
2kg
Acceleration
3m/s²
How it works
Newton's second law says force equals mass times acceleration. A 2 kg mass pushed at 3 m/s² feels 6 newtons of force — that's F = m·a in one line.
Because it's a single equation with three quantities, knowing any two pins down the third. Leave one field blank and the calculator rearranges the formula: mass is force over acceleration, acceleration is force over mass.
A newton is the force that gives a 1 kg mass an acceleration of 1 m/s². For a sense of scale, holding a small apple against gravity takes roughly one newton.
Frequently asked questions
What is Newton's second law in plain words?
Push harder and something accelerates faster; make it heavier and the same push accelerates it less. Force, mass, and acceleration are locked together by F = ma.
How do I find mass from force and acceleration?
Divide the force by the acceleration. A 12 N push producing 4 m/s² means the mass is 12 / 4 = 3 kg. Leave the mass field blank and this tool does that division for you.
What is one newton?
The force needed to accelerate one kilogram at one meter per second squared. That's about the weight of a medium apple sitting in your hand.