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why is weight a scalar quantity

Though the force is vector quantity why weight is scalar?
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Weight is only defined for the objects in earth which has the direction vertically downward.So whenever you think about addition of weight,according to vector law addition,their magnitudes are just to be summed because angle between two weight forces are zero every where.
So weight obeys vector law of addition.
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Temporarily we consider mass is a scalar, but newton proved that mass is also a vector. If an object can be moved with the velocity of light, the mass changes at the direction of light.. Idea of time traveling is based on this..
And definitely weight is a vector.
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Forces are vectors. A downward force(like weight) is affects a body differently than an upward force (like the floor's normal force). And both of these forces affect a body differently than horizontal forces, like human pushes and pulls, or friction.Mass by contrast is a scalar. Mass is the amount of material in an object(although a more formal definition exists). Mass exists regardless of gravity's existence. Mass has no directionality.Do not confuse mass and weight, even though in everyday speech these terms are misused interchangeably.
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Point that makes it vector is it is force and point that doesn't make it vector is it is never negative, it has never arrow head or it is never added vector wise as it is always downward.
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Weight is a vector. Just like centrifugal force which is a directed force. Weight is directed towards the center of earth. Also, scalar has a property that its value doesn't vary at different places like mass. Mass remains same everywhere. But, go to space and you are weightless. So weight is vector.
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