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How mirror can be identified by observing the values of the magnification?

How mirror can be identified by observing the values of the magnification? If an object is placed within the focal length of a mirror, the image of the object will get magnified in case of a concave mirror, and will get diminished in case of a convex mirror. The value of magnification will be greater than 1 in case of a concave mirror, and less than 1 in case of a convex mirror.

What is Work?

What is Work?

To introduce the definition of work done by a force, we begin with the simple case of motion along a straight line, with the force along the line of motion, Consider a particle moving along a straight line, say, the x-axis, and suppose that a constant force F, directed along the same straight line, acts on the particle. For example, the particle might be a stalled automobile that you are pushing along a road. 


Then the work done by the force F on the particle as it moves some given distance S is defined as the product of the force and the displacement,

W = F. S =FSCos α

where α is the angle between the force F and the displacement S. Work
is a scalar quantity. The unit of work is
[W] = [F] [S]
In metric system, unit of work is Joule.

[W] = 1 Joule = 1 N.m





In CGS system, unit of work is erg.

Relation between the units of work is

1 Joule = 1 N.m = 105D. 102 cm = 107 ergs.

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