The negative of the work done 'by the co...

The negative of the work done 'by the conservative internal forces on a system equals the change in:

total energy

kinetic energy

potential energy

none of these

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S_(1): If the internal forces within a system are conservative, then the work done by the external forces on the system is equal to the change in mechanical energy of the system. S_(2): The potential energy of a particle moving along x- axis in a conservative force field is U=2x^(2)-5x+1 is S.I. units. No other forces are acting on it. It has a stable equalibrium position at one point on x- axis. S_(3) : Internal forces can perform net work on a rigid body. S_(4) : Internal forces can perform net work on a non - rigid body.

When is work done by a force negative ?

Can work done by a non - conservative force be positive ?

Is work done by a non conservative force always negative ? Comment.

A particle is taken from point A to point B under the influence of a force field. Now it is taken back from B to A and it is observed that the work done in taking the particle from A to B is not equal to the work done in taking it from B to A. If W_(nc) and W_c are the work done by non-conservative and conservative forces present in the system, respectively, DeltaU is the change in potential energy and Deltak is the change in kinetic energy, then

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