WORK = FORCE x DISPLACEMENT. Both force and displacement are vector quantities. Then how is work a scaler quantity. Please explain.

Asked by mehreennisar | 7th Oct, 2010, 05:05: PM

Expert Answer:

Dear student
Work is a scaler quantity as it is defined as a dot product between two vector quantites.
Work as a physical quanity, does not require to be associated with any direction for its complete explanation. Also when two'Work dones' are algeabraically operated, that is, added or subtracted, they donot follow the conventional rules (parallelogram law of addition) of vector addition. Hence Work is not classified as a vector quantity.
On similar lines, even pressure is not a vector quanity.
We hope that clarifies your doubt.

Answered by  | 8th Oct, 2010, 06:31: AM

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