9 science and Technology. I
Answers
Explanation:
Work, in physics, measure of energy transfer that occurs when an object is moved over a distance by an external force at least part of which is applied in the direction of the displacement. To express this concept mathematically, the work W is equal to the force f times the distance d, or
W = fd.
CGS unit of work is erg
1 joule is the amount of work required to move an object by 1 metre by applying a force of 1 Newton. Similarly, the erg is the unit of work in the CGS system. One erg is defined as the work done by a force of one dyne to move a distance of one cm.
Answer:
Work is defined as the product of force applied on an object and the displacement of the object as a result of the application of force.
Work done = Force × Displacement × cos θ
If Work done = W, Force = F and Displacement = s
W= F×s
( θ= angle formed by force and displacement)
- It is a scalar quantity an has magnitude but no direction.
- It is the only case where it can be calculated in terms of +ve,-ve and 0 but still it is vector
SI unit of Work = Force× Displacement = N×m= J
CGS unit of Work = Force× Displacement = Dyne×cm = erg
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