About Lesson
Introduction
We use the words work, energy and power in our day-to-day life often. However, their meaning differ from the meaning we get from scientific definitions.
![Class 11 Physics Work Energy Power Notes](http://free-education.in/wp-content/uploads/2020/12/image-512.png)
Scalar product
- The scalar product or dot product of any two vectors A and B, denoted as A.B (Read A dot B) is defined as , where q is the angle between the two vectors.
- A, B and cos θ are scalars, the dot product of A and B is a scalar quantity. Both vectors, A and B, have a direction but their scalar product does not have a direction.
- B is the product of the magnitude of A and the component of B along A. Alternatively, it is the product of the magnitude of B and the component of A along B.
![Class 11 Physics Work Energy Power Notes](http://free-education.in/wp-content/uploads/2020/12/image-513.png)
![](http://free-education.in/wp-content/uploads/2020/12/image-514.png)
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