Work power energy Flashcards

1
Q

When is work done positive ?

A

when theta is acute ( cos is positive )

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2
Q

What are conservative forces ?

A

IF work done by a force During round trip of a system is always zero, the force is set to be conservative

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3
Q

what is the work done by a force depends on initial and final states and not on the part taken ?

A

It is a Conservative force

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4
Q

What is non conservative force

A

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

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5
Q

what is law of conservation of mechanical energy

A

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

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6
Q

Work done by a particle is ??

A

change in its kinetic energy

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7
Q

When is the mechanical energy of the system not constant

A

if some of the internal forces are non conservative

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