Force Calculator
Newton's second law: force from mass and acceleration.
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Formula
F = m × a
Force in newtons equals mass in kilograms times acceleration in m/s². One newton accelerates one kilogram at 1 m/s².
Worked example
A 10 kg object at 9.8 m/s² (near Earth gravity) experiences about 98 N of force.
Where this can give the wrong answer
- Mass must be positive — negative mass is not physical in classical mechanics.
- This is net force; friction and other forces may need combining separately.
- Relativistic speeds need special relativity, not this classical formula.
FAQ
- Weight is the gravitational force mg near Earth. This calculator takes any acceleration, not only g.