Thermodynamics and Statistical Mechanics

Is the work done by the system is considered as positive or on the system is considered as positive?


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2011-08-26 12:17:09
2011-08-26 12:17:09

Work done by the system is considered as Positive

Work done on the system is considered as Negative

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If work is done on the system then it has a negative sign. If work is done by the system then it has a positive sign.

work done on the system: when a surrounding does work on the system the total energy increases so work done is positive..........

There are different conventions as to what work is negative and what work is positive. The convention used by engineers and physicists is that work done BY the system on its surroundings is positive while work done ON the system by its surroundings is negative. Chemists reverse these conventions.

Yes - work can be done BY a system or ON a system. Depending on whether the work is going into the system or out of it the sign on the work can be negative or positive.

In thermodynamics, work done by a system on its surroundings or another system is said to be positive.

work done by the system increases entropy of the surroundings

First, there are certain sign conventions. It could be defined in a different way, but things are traditionally done in a certain way. Second, if work going out of the system is defined as positive, then it is quite logical that work going into a system should have the opposite sign.

There are two conventions. One says that work done on the system is positive, the other says that work done by the system is positive. Chemists tend to use the former, physicists tend to use the latter... one of several reasons it's not a good idea to take thermodynamics in chemistry and physics at the same time.

Positive work is work done in the direction of motion, while negative work is work done in the opposite direction from the motion.opposite

POSITIVE work is done when the direction of displacement and gravitational force is same. This makes an angle of zero degrees. Fd?FScos0 equals +1. The work done is positive.

If the angle between the displacement and force applied is less than a right angle, then it is Positive Work done. If the angle between the displacement and the force applied is greater than a right angle then it is Negative Work done. If the displacement and force are at right angles, or either is zero, then it is Zero Work done.

If work is done on a system as compression work and no heat interaction is allowedbetween the system and the surroundings, then you have an adiabatic compression.

The answer is positive because the force and direction are the same, therefore work is also positive.

Energy is the potential to do some work. If there is work done on a system, this work done is stored as potential energy of the system. If the system in motion, it should have kinetic energy. Hence total energy of the system PE+KE

If the system does work on the surrounding, the work (w) has a negative sign, i.e. -w. If the surrounding do work on the system, then the sign is positive (+).

Well first lets define a feedback mechanism. It is defined as a system having influence over another system either positively or negatively. Positive can be done in the form of rewards, these always seem to work for people.

The work done in an adiabatic process is done without the transfer of heat or matter between a system and its surroundings. This is done through pressure-volume work.

It is the work done to moving a unit positive charge or test charge from one to another point in electric field this work done is called the potential difference.

Internal energy increases whenever heat is added to a system. The same applies to the external work done by the system.

If a force is applied, but nothing in the system moves, no work has been done. Work is only done when something moves.

Yes. As an example: if you define a refrigerator as your system, the work done on the system causes heat to be expelled from the system to the surroundings. The net heat expelled will be equal to the work input plus the decrease in its thermal energy.

No the work done is still positive, the force exerted and the work done to exert that force is still the same. Its just that the other object is exerting more of a force on the object doing the work.

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