- #106
Dale
Mentor
- 35,301
- 13,523
An approach that I endorse also.jbriggs444 said:My approach to problem solving is to simplify, simplify, simplify.
An approach that I endorse also.jbriggs444 said:My approach to problem solving is to simplify, simplify, simplify.
This objection is not appropriate, because the spinning gyro is also already moving, and a torque perpendicular to its angular velocity doesn't increase its KE. Just like a force perpendicular to linear velocity doesn't increase KE.bobie said:This example is not appropriate, because the body is already moving, and you are not increasing its speed or KE (same applies to orbits, etc.).
Yes it is wrong. In particular the "undeniably" & "must" part.bobie said:if an object is rotating in one plane it has k KE, if you make it rotate in 2 different planes it has undeniably KE > k, somebody must have given it some KE and therefore must have spent some energy. Is that vague to you? Is this wrong or arguable in any case?