Work is defined as the product of force and displacement .Both are vector physical quantities. Still work is a scalar physical quantity.Why? Explain.

Asked by rkjha_in | 29th Nov, 2014, 08:29: PM

Expert Answer:

Work is not just defined as a simple product of force and displacement.
It is actually a dot product of the two quantities.
Vectors cannot be multiplied regularly. They can be multiplied in two ways, viz. DOT product and CROSS product.
Now, work done is a dot product of force and displacement. Dot product yields a scalar quantity.
Hence, work is a scalar quantity.

Answered by Romal Bhansali | 30th Nov, 2014, 05:13: PM