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The newton is the SI basic unit of force.

While there is no SI basic unit for weight, we use the kilogram and pound as the operational or practical units of weight. This is the effect that an object has on the calibrated springs of a scale.

However, this answer is useful only in very basic math classes and in commerce.

The correct answer is that the basic unit of MASS is the kilogram and the basic unit of FORCE is the newton.

If we use weight to mean mass, it is wrong because mass is a scalar quantity. We can use weight to mean force, but force is a vector quantity and measured in newtons.

In aerodynamics, weight is used only as a vector quantity to describe the 4 forces that affect an object interacting with a fluid medium: Weight, drag, lift and thrust.

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13y ago

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