- #1
alba
- 140
- 4
What is the difference between velocity and change of velocity?. I have read that change of velocity is not acceleration, if this is true, what is it and what are its units? are they just m/s? is it just velocity?
1) If I push a bowl (m=1) at curling, and ##\Delta v = 10m/s## , haven't I accelerated it by 10m/s? and given it a change of momentum = 10 Kgm/s and Ke = 50 J?
2) Now, another more difficult aspect: I can push it by .5 or 1 m , but the change of velocity is the same, how do I reconcile it with work = 50 J in both cases?
3) the same with time, I can push it for .5 or 1 or 2 seconds, and work is still 50 J how do I reconcile it with impulse?
Why in one case we refer to work done and in another to change of momentum? Can I use every concept in every situation, or sometimes there is an obliged choice?
Thanks
1) If I push a bowl (m=1) at curling, and ##\Delta v = 10m/s## , haven't I accelerated it by 10m/s? and given it a change of momentum = 10 Kgm/s and Ke = 50 J?
2) Now, another more difficult aspect: I can push it by .5 or 1 m , but the change of velocity is the same, how do I reconcile it with work = 50 J in both cases?
3) the same with time, I can push it for .5 or 1 or 2 seconds, and work is still 50 J how do I reconcile it with impulse?
Why in one case we refer to work done and in another to change of momentum? Can I use every concept in every situation, or sometimes there is an obliged choice?
Thanks