- #1
nitai108
- 14
- 0
Newton's second law states F = d(mv)/dt as this law is valid only for constant mass systems it is also written as F = md(v)/dt.
But let's suppose the mass was not a constant, then the derivative of the law would become F = m'v + mv' (where by ' I mean derivative, m' = dm/dt), would that be right?
If the law is valid only for constant mass why are we writing it inside the derivative and only after that we take it out as a constant?
But let's suppose the mass was not a constant, then the derivative of the law would become F = m'v + mv' (where by ' I mean derivative, m' = dm/dt), would that be right?
If the law is valid only for constant mass why are we writing it inside the derivative and only after that we take it out as a constant?