1energy is always considered in real frame......!!!
there is no such term as relative energy......
Consider a case we r standing on earth and a ball is moving with a velocity v0....
so its energy is=1/2mv2..........
now when we are standing on a platform which is moving with a velocity v0,
so as we see the ball is moving with a velocity of (v-v0) with respect to me......
so its energy becomes E=1/2m(v-v0)2.........
=1/2m(v2-2v.v0+v02)
so we can see that the energy changes......but if that is the case, then how to find out the energy when we r in a moving frame of reference???????
now as energy is not vector bt scalar, there should be nothing called relative energy as irrespective of direction their value is always positive.........
so what is the reason of this???????
how can this change in energy explained???????
so if there is no absolute rest then is the term absolute energy absurd???????
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4 Answers
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3see kinetic energy or potential energy depends upon the frame in which u were seeing.See if u r writing energy eqns with respect to earth ,but earth is itself a moving frame,it is actually moving abt the sun ,sun in turn moving wrt our galaxy and our galaxy is moving with respect to some other thing.
1energy is not a vector its true,but its frame dependent.as we change our frame velocity changes and hence k.e also changes.as you know work done also depends on frame of ref..work done = change in k.e.so change in k.e is also frame dependent and hence k.e is also frame dependent.
1bt.....den when we measure the energy of the air molecules, we actually measure da k.e.......what is da guarantee of the measurement we take??????????