Recent content by ColinD

It points down the hill. Its counterintuitive how static friction does zero work because there is no displacement of contact point, yet is changes the speed of the rolling ball.

That seems contradictory. How come in one case you take static friction does into account as a force, thus acceleration. But in the other the same force does not cause acceleration.

Static friction does not cause an acceleration on its own thought, correct? I am talking in the ideal case with no deformation. If a ball was rolling without slipping on a flat surface it wouldn't slow down, it would roll forever. Isnt it the same going up an incline?

So the maximum height it reaches in the frictionless case is less, which is strange because both cases have the same initial center of mass velocity and experience identical center of mass acceleration (only due to gravity, not friction), yet the center of mass behaves differently. How?

The setup is a flat friction surface where the ball rolls without slipping. Next, in one case it goes up a friction incline, and in the other a frictionless incline. Which ball leaves the incline faster? Both are given the same initial push. At the bottom of the incline both balls have the same...

Paramagnetism: How does having an unpaired electron attract it into a magnetic field. Why not repel? Is there any reason or we just know from experiment? Diamagnetism: If the electron spins and therefore magnetic fields cancel, what is causing it to repel from a magnetic field? If it is...

isnt there a second redox reaction inside the added battery. exactly how is force added

I thought thatan electronwould still experience the same amount of work if there were 1 or 2 batteries because it still is only moving from a negative to a positive terminal. Whether itsN1 to P1or N1 toP2, isn't the same amountof work done? Side question: when you connect N2 to P1 wwith a...

If I connected 2 batteries together in series Positive-Negative-Positive-Negative, I've read many times the voltage (joules/coulomb) adds. I cannot understand what is going on to cause this at the ATOMIC level. Electrons in a battery are produced by a redox reaction and are attracted to the...