Grade 12Mechanics
Does the work energy theorem always and absolutely deals with change in kinetic energy or in some cases with change in mechanical energy? There is a sum of gravitation A person brings a mass of 1 kg from infinity to a point A. Initially it was at rest but as it reaches A velocity becomes 2m/s . The work done by the peron on the mass is -3J the potential at A isa) -3b) -5Ans is b) What I have done is loss in P.E + Gain in K.E = work doneI.e -GMm/R + 1/2mv^2 = -3-GMm/R+ 2 = -3So p.e is -5It will be extremely helpful if you say if my concept is clear or somewhere faulty. Will look forward eagerly for an explicit explanation.
Does the work energy theorem always and absolutely deals with change in kinetic energy or in some cases with change in mechanical energy?
There is a sum of gravitation
A person brings a mass of 1 kg from infinity to a point A. Initially it was at rest but as it reaches A velocity becomes 2m/s . The work done by the peron on the mass is -3J the potential at A is
a) -3
b) -5
Ans is b)
What I have done is loss in P.E + Gain in K.E = work done
I.e
-GMm/R + 1/2mv^2 = -3
-GMm/R+ 2 = -3
So p.e is -5
It will be extremely helpful if you say if my concept is clear or somewhere faulty. Will look forward eagerly for an explicit explanation.
