Newton's Second Law

Solve F = ma — find force, mass, or acceleration from any two values

F = m × a → 10 N = 5 kg × 2 m/s²
Force (F)
10N
Mass (m)
5kg
Acceleration (a)
2m/s²
m = 5kgF = 10 Na = 2 m/s²F = m × a10 N = 5 kg × 2 m/s²

About this calculator

Newton's Second Law Calculator solves F = ma for force, mass, or acceleration. Enter any two of the three values to instantly find the third. Supports multiple unit systems including Newtons, pounds-force, kilograms, and grams — ideal for physics, engineering, and mechanics problems.

Common examples

  • m = 10 kg, a = 9.8 m/s² → F = 98 N (weight of a 10 kg object)
  • F = 500 N, m = 50 kg → a = 10 m/s²
  • F = 1,000 N, a = 2 m/s² → m = 500 kg
  • m = 0.5 kg, a = 20 m/s² → F = 10 N
  • F = 200 N, m = 80 kg → a = 2.5 m/s²