Work power energy

Question 1

When is work done positive ?

Answer 1

when theta is acute ( cos is positive )

Question 2

What are conservative forces ?

Answer 2

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

Question 3

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

Answer 3

It is a Conservative force

Question 4

What is non conservative force

Answer 4

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

Question 5

what is law of conservation of mechanical energy

Answer 5

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

Question 6

Work done by a particle is ??

Answer 6

change in its kinetic energy

Question 7

When is the mechanical energy of the system not constant

Answer 7

if some of the internal forces are non conservative