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?
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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.