Force calculator (F = ma)
The second law in its everyday form, with unit pickers for both newtons and pounds-force.
m/s2
Force
140N
- Weight under standard gravity
- 686.4655
- Acceleration in g
- 0.203 943
- Resultant with gravity
- 700.596 09
Show the working
- Mass = 70
- Acceleration = 2
- Force = 70 * 2 = 140
- Weight under standard gravity = 70 * g0 = 686.466
- Acceleration in g = 2 / g0 = 0.203 943
- Resultant with gravity = 70 * sqrt(2^2 + g0^2) = 700.596
Values are shown to six significant figures here; the arithmetic itself runs on exact fractions and is only rounded where a number is printed.
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The formula
- F = m a
- weight = m g
Mass is a property of the object; weight is a force and changes with gravity. A kilogram is a mass, a kilogram-force is a weight.