Work power energy Flashcards
When is work done positive ?
when theta is acute ( cos is positive )
What are conservative forces ?
IF work done by a force During round trip of a system is always zero, the force is set to be conservative
what is the work done by a force depends on initial and final states and not on the part taken ?
It is a Conservative force
What is non conservative force
A force is set to be non conservative if work done towards or against the force in moving a body from one position to another depends on path followed between final and initial position
what is law of conservation of mechanical energy
if only conservative forces are acting on a system of particles and potential energy is u is defined corresponding to the forces There are either no forces or the work done by the system is 0
sum of potential and kinetic energy
Work done by a particle is ??
change in its kinetic energy
When is the mechanical energy of the system not constant
if some of the internal forces are non conservative