Question

define erg and define magnitude of force​

Answer 1

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The erg is a unit of energy equal to 10−7 joules. ... Its name is derived from ergon (ἔργον), a Greek word meaning work or task. An erg is the amount of work done by a force of one dyne exerted for a distance of one centimeter. In the CGS base units, it is equal to one gram centimeter-squared per second-squared (g⋅cm2/s2).

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Answer 2

erg:-The erg is a unit of energy equal to 10−7 joules. ... Its name is derived from ergon (ἔργον), a Greek word meaning work or task. An erg is the amount of work done by a force of one dyne exerted for a distance of one centimeter. In the CGS base units, it is equal to one gram centimeter-squared per second-squared (g⋅cm2/s2).

magnitude of forces:-The magnitude is simply the word used to mean the size of the force/ how hard the force is pushing. The magnitude does not tell you anything about the direction of the force. Forces are vector quantities so to describe a force fully, you need to give both, the size/magnitude and the direction.