Physics Formulas: Motion, Force and Energy Explained
The core mechanics formulas every student needs — velocity, acceleration, the equations of motion, force, momentum, work, energy and power — explained plainly with worked examples.
Force Calculator
Verified formula Updated Jun 2026 Private — runs on your device
Verified formula
Private
Force (F = ma)
98.000
For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.
How to use the Force Calculator
The Force Calculator works out your force (f = ma) in an instant. Enter mass and acceleration and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.
- Enter the mass.
- Enter the acceleration.
- Read off your force (f = ma) — the calculator updates automatically, with no button to press.
Formula
The Force Calculator uses the formula:
Force (F = ma) = Mass × Acceleration
Worked example
For example, with mass of 10 kg and acceleration of 9.8 m/s², the force (f = ma) is 98.000.
| Mass | 10 kg |
|---|---|
| Acceleration | 9.8 m/s² |
| Force (F = ma) | 98.000 |
|---|
Results are estimates for educational use, not professional advice.
Key terms explained
- Acceleration
- The rate at which an object's velocity changes over time.
- Force
- A push or pull on an object, equal to mass × acceleration (Newton's second law).
Frequently asked questions
Newton's second law: force = mass × acceleration (F = ma). A 10 kg mass at 9.8 m/s² experiences a force of 98 newtons.
A newton (N) is the force needed to accelerate 1 kilogram at 1 metre per second squared. It is the SI unit of force.
To find weight, use gravity, about 9.8 m/s² on Earth. So a 10 kg object weighs about 98 newtons.
Yes. Mass is force ÷ acceleration and acceleration is force ÷ mass. This tool multiplies mass by acceleration to give force.
Enter the mass. Enter the acceleration. Read off your force (f = ma) — the calculator updates automatically, with no button to press.