- #36
Dickfore
- 2,987
- 5
D H said:You can also find others that claim that Newton's laws, strictly speaking, apply only to particles, so it doesn't matter which definition you use.
This is the point. Please derive
[tex]
\Sigma\mathbf{F}_{ex} = \frac{d \mathbf{P}}{d t}
[/tex]
for an (open) system with variable mass.