Force calculator (F = ma)
Newton's second law states that the net force on a body equals its mass times its acceleration: F = m · a. One newton is the force that gives a mass of one kilogram an acceleration of one metre per second squared.
kg
m/s²
Gravity on Earth is 9.80665 m/s² — leave it as is to get the body's weight.
Force
686.465N
- In kilonewtons
- 0.6865kN
- In kilogram-force
- 70kgf
Rates and thresholds
- Newton's second law
- F = m · a
- Newton
- 1 N = 1 kg · m/s²
- Standard gravity
- 9.80665 m/s²
- Weight on Earth
- F = m · 9.80665
What is the difference between mass and weight?
Mass is how much matter a body contains, measured in kilograms, and it does not depend on where you are. Weight is the force gravity exerts on that body, measured in newtons. A mass of seventy kilograms is the same on Earth, on the Moon and in free fall, but its weight is about 686 N on Earth and roughly six times less on the Moon. Everyday speech calls mass 'weight'; physics does not.
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