Science calculator
Newton's second law.
The resultant force on an object equals its mass times its acceleration, F = m a. Type the two values you know, in whatever units suit, and leave the one you want blank — it appears on the display. GCSE and A-level; the assumptions are stated below.
- F resultant force (N) · m mass (kg) · a acceleration (m/s²)
Assumptions
- F is the resultant (net) force — add up all forces first, including friction and weight.
- Mass is constant (nothing gained or lost; non-relativistic).
- Force and acceleration act along the same line — treated as magnitudes in one dimension.
- SI units: newtons, kilograms, metres per second squared.
How it works
A resultant force makes a mass accelerate: double the force for the same mass and you double the acceleration; double the mass for the same force and you halve it. The same equation rearranges to find any of the three — whichever box you leave blank is the one that gets solved.
Results use up to three significant figures by default (adjustable above), without padding the display with trailing zeroes. Enter the resultant force, not a single push — if several forces act, combine them first.
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