Force Calculator (F=ma)
Find the net force on an object from its mass and acceleration using Newton's second law.
kg
m/s²
0.0981 kN
10.003 kgf
Formula
Examples
| Input | Result |
|---|---|
| m = 10 kg, a = 9.81 m/s² | F = 98.1 N |
About this calculator
Newton's second law of motion states that the net force acting on an object equals its mass multiplied by its acceleration (F = m × a). Force is measured in newtons (N), where one newton is the force needed to accelerate a one-kilogram mass at one metre per second squared.
This relationship is fundamental to classical mechanics. A larger mass requires more force to achieve the same acceleration, and for a fixed force, a heavier object accelerates more slowly. Be sure to use SI units — kilograms for mass and metres per second squared for acceleration — to obtain force directly in newtons.
Frequently asked questions
Force equals mass times acceleration: F = m × a. With mass in kilograms and acceleration in m/s², force comes out in newtons.
One newton (1 N) is the force required to accelerate a mass of one kilogram at one metre per second squared.
Divide the force in newtons by 9.80665. For example, 98.1 N ÷ 9.80665 ≈ 10 kgf.
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