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Scalar quantity is the usual one. It is already there unavoidable. But vector is the new one. Why do we need it?

Suppose say two persons by name John and Johann push a box with forces 4N and 3N, what could be the effective force on the box?

One may say 7 N by adding them. One may say just 1N because of getting the difference. Another may say 5N. How?

Why do they give different answers?

It is because the directions in which the forces acting are considered in different ways.

If both in the same, addition is ok. If in opposite then difference is right one. If they are at right angles then pythagros technique. So direction is the most essential data to get the right answer.

Hence magnitude with direction is known to be vector quantity.

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13y ago

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