Recent content by sophiecentaur

This is a DIY project which means a hypothetical or practical application before the OP's motor can be considered suitable - possible power out when driven by a particular source. If the source is a wind turbine then the possible size would be highly relevant because a small turbine may not...

Are you, perhaps trying to jump into this too far, too fast? At this level of symbolic representation and manipulation, "concrete examples" may be hard to find, off the shelf. You say that you find Physics not actually that complicated. Fact is that it really is complicated and can only be...

If you have Googled this then you will have see a diagram of a grounded system. If every exposed piece of metal is connected to ground (and I mean every), then a person can touch any two thins and have only Zero Volts across them. =safe

The 'context' is in the title; namely that varying speed and acceleration are relevant in a simple collision that is treated as being instantaneous. So I really think that my nagging is appropriate. The problem has to either be really basic or very complicated. The can of worms from a 'real'...

I bet they don't differ much between designs - cheap and short lived. That Wiki article says most of what we need to know, I think.

You made this comment earlier. You used the formula for KE which, of course, is correct but your implied reasoning is almost totally maths based and your conclusion is totally maths based. Shutters often come down for many PF visitors. I have a bit of a crusade to present help in as tangible...

Why not? We are not dealing with an anode and cathode as with DC . Both ends of the streams are under much the same (AC) conditions once every cycle of the 35kHz supply voltage. Because the curvature of the inner sphere and outer sphere there will be an overall difference in field but I would...

Possibly momentum in the wrong direction - the best sort for New Year

The OP starts off with reference to constant velocity and constant acceleration. How can he be convinced that those ideas cannot be explored at this level. How to convince him without making very clear that simple mechanics can’t do it? Read the first post again and you may see what I’m getting at.

It would be much easier to think in terms of a stereoscopic display. all you'd need is some software and coloured glasses. Can you not do this 'off the shelf' for available 3D printers? (never used one, tbh but that's not really relevant.)

Very often that's a very good approximation but what about when the collision is when the brakes have just been applied hard? (Tyre marks often tell a useful story; zero length if the driver had died at the wheel.)

Exactly. If the Force is enough to keep the object accelerating after / during contact (especially at the same rate) then it would need to increase to keep up with the extra work. Newton 2 tells you that. So, to deal with the acceleration factor, you would need to know the masses of the object...

The OP could clear up the context of the question. It all depends on where the original question arose in his mind. If it came from a list of text book - type questions then It was not helpful for any student because it's totally open ended and has no answer. The wording of the question...

Except he is using car driving as a scenario. Are we discussing a lab experiment with an object hitting a spring / buffer? No, I don’t think so. The OP seems to want to do the whole thing in one go and doesn’t seem to accept that the full scenario is very complicated. If the scenario involves an...

Yes; as with a bouncy spring but does this relate to a car collision? Only in Bugs Bunny lol. The scenario is a bit undefined but, then, the whole problem is a bit vague. Without some disciplined Physics we can’t conclude anything.