Force Calculator

Calculate net force in newtons from positive mass in kilograms and signed acceleration in metres per second squared.

Calculate net force

Force: 36 NThe sign follows the selected positive direction for acceleration.

How this tool works

Newton's second-law relationship connects net force, mass, and acceleration. The calculator accepts signed acceleration so the result can represent direction along a selected one-dimensional axis rather than discarding the sign.

Net force F equals mass m multiplied by acceleration a. Kilograms multiplied by metres per second squared produce newtons.

How to use it

  1. Enter positive mass in kilograms.
  2. Enter signed acceleration in metres per second squared.
  3. Read the net-force result using the same selected direction convention.

Worked examples

Positive acceleration

Input
12 kg at 3 m/s²
Output
36 N

Multiplying twelve kilograms by three metres per second squared gives a net force magnitude of thirty-six newtons.

Opposite direction

Input
5 kg at -2 m/s²
Output
-10 N

The negative acceleration indicates the selected opposite direction, so multiplying by positive mass produces a signed force of negative ten newtons.

Limitations

  • The calculator does not resolve multiple vector forces.
  • Relativistic systems and variable-mass dynamics require different treatment.