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### Work done over a closed loop

Is it true that the work done in the motion of a body over a closed loop is zero for every force in nature?
51 views

### Sign of the work done by dissipation forces

I don't understand this passage from the book I'm reading: Physically, it is clear that a system cannot be conservative if friction or other dissipation forces are present, because \$\mathbf{F}\...
46 views

### Force, work and the apparent disappearance of Mechanical Energy [duplicate]

A man exerts force on a wall of bricks. The man must have consumed the energy he possessed (mechanical energy?) to exert the force. The man sweats and tires himself out but the wall does not move. ...
521 views

### Energy dissipated by friction vs Work done by friction

Is energy dissipated by friction the same as work done by friction where the equation is W(friction) = Ff * d cos theta . However, since work is the transfer of energy and not energy itself then is ...
79 views

### Why is there no friction energy?

Can anyone briefly explain to me why is there no term for frictional energy when they often referred to work done by friction instead? Thank you
2k views

### What exactly makes a force conservative?

I get that forces can be classified as either conservative or non-conservative, depending on whether the work done in a round trip is zero or non-zero. What property of the force makes it to be, ...
2k views

### Work done in thermodynamics [duplicate]

The work done in thermodynamic process is given by the integral of Pdv and also we can write so assuming a quasi static process between two points. But this work is then non dissipative work or work ...
661 views

### Dissipation and first law of thermodynamics

Consider the following situation: a certain gas is contained in a well-insulated cylinder with a well-insulated piston head. Now, in this case the piston is not frictionless. In order for the piston ...