Newton Second Law Calculator
Newton's Second Law Calculator works out Net force and Mass from Mass, Acceleration and Net force. The default figures on this page give net force of 6 N; change any entry and the result, the working and the sources update together.
Your figures
Updates as you typeHow this is worked out
2 steps
- F = m a = 2 kg x 3 m/s^2 = 6 N
- Weight under gravity = 2 x 9.80665 = 19.6133 N
Its 4 worked examples are re-run on every release, last on 15 September 2026. What changed
Sources and references
2 sources
What the Newton's Second Law Calculator calculates
Relates net force, mass and acceleration, solving for whichever is unknown, and reports the weight of the mass under gravity.
How to use this Newton's Second Law Calculator
Enter Mass, Acceleration, Net force and Gravitational acceleration. Net force updates as you type, and “Use a worked example” loads checked figures you can adjust. Change one figure at a time to see what drives the result.
How the result is worked out
Open “How this is worked out” beside the result for the step-by-step calculation behind Net force, Mass and Acceleration.
The method follows Newtonian mechanics: v = dx/dt, F = ma, J = F dt = dp, and the work-energy relations and BIPM, The International System of Units (SI Brochure).
Research R3528-GT-1: 2 kg at 3 m/s^2 example
With Mass: 2, Acceleration: 3, the calculator returns Net force: 6. This example is checked against an independent source in the test suite.
What you can compare
Change one input at a time to see how it affects Net force, Mass and Acceleration. The inputs you can vary are Mass, Acceleration, Net force and Gravitational acceleration.
Results are general information, not financial, tax, legal, medical or engineering advice. Check any decision that matters with a qualified professional.
See something wrong? Report a problem with this calculator
Frequently asked questions
What is the formula for the 2nd law?
On the figures this page opens with — mass 2 kg and acceleration 3 m/s² — the net force is 6 N. No single number fits everyone: change any figure above and the answer updates as you type, with each step of the arithmetic beside it.
What is the correct equation for Newtons second law?
It needs Mass, Acceleration, Net force and Gravitational acceleration. Nothing else is required, and the figures stay in your browser.
What information do I need for the Newton's Second Law Calculator?
You need Mass, Acceleration, Net force and Gravitational acceleration. The page opens with default figures that give net force of 6 N, so you can see the scale before entering your own.
What does this Newton's Second Law Calculator show?
It shows Net force, Mass, Acceleration, Weight under gravity, Force in kilogram-force and Solved for, with the working and any warnings for your entries.
Can I check how the Newton's Second Law Calculator result was calculated?
Yes. The “How this is worked out” section shows the calculation steps, and the sources section identifies the references used for the method.