Recent content by LeeB

Jeff... Okay, you say there's work being done because there's an inward component of velocity. My question is... "What's the source of the new energy?" In the first case, it ultimately came from the energy in food eaten by the student. There is no obvious source of new energy here, yet the...

I don't know if it was three years ago, but yes. I did. I never got an answer then and I still don't know if I've gotten one yet here. As for how we set it up, we did this: Instead of going DOWN through the center of the table for the first part, we arranged a bracket with an eye at the...

We used a PASCO motion sensor. (And furthermore, it was totally obvious that the puck was moving MUCH faster when the string was shorter.) A torque can't provide more energy because the force is perpendicular to the motion, right? So where did the extra energy come from?

Additional question, then... So if there is no work done, then you are suggesting that the new velocity WON'T be twice the old velocity under these circumstances? When we actually did this on an air table, the results were virtually identical to the first case. The puck DID speed up and...

I have a question about a classical physics problem. The original problem appeared as a homework problem in a physics book and it is really an extension of the problem that causes me an issue. The original problem went something like this: A frictionless puck travels, with linear velocity...