- #1
madah12
- 326
- 1
I have a problem understanding how we can say that an object has energy of x joules because energy depends on the frame of reference right ? I mean let say a bird is moving with velocity of 5 m/s if I were a stationary man I would observe that it has a kinetic energy but if I were moving with 5 m/s then it would have zero energy, so how can energy be a meassure of the capacity of an object to do work and why is it considered to be the same thing as mass as being a property of the object itself if it depends on the frame of reference?