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Force is expressed in Newtons

It's newtons - never capitalised, , but the abbreviation, N, *is*, because it's derived from a personal name.

The simplest example is the force due to gravity.

Strictly speaking, weight is *not* expressed in grams/kilograms/tonnes. These are measures of *mass*, and a 1 kg object will always have that mass (at ordinary speeds), whether it's on earth or out in space.

Here on earth, due to gravity, the 1 kg mass experiences a force of 1 kilogram-force.

Because the force of acceleration due to gravity is abuout 9.81 metres/second, 1 kilogram-force equates to 9.81 newtons.

My mass of around 70 kg becomes a weight of about 690 N.

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Richard Grimes

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3y ago

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