Can someone explain the part in the red outline? Why are some of the terms ignored? Also if dr goes to 0, doesnt the whole thing just become 0?
M3 Statics of Rigid Bodies Watch
- Thread Starter
- 21-04-2017 15:02
- 21-04-2017 15:33
Now divide both sides by which is OK, since it's non-zero, and we get:
Now let and all terms except the first on each side become arbitrarily small. That is why they can ignore some terms straight off - because in the final step, they will go to 0 anyway.