Recent content by cardboard_box

yes, let me give a hopefully better example, if we are using a linear shooter (2 counter-rotating wheels and the projectile in the middle) then we add another set of wheels (fully identical to the first set with same RPM and everything). it really shouldn't matter at all to the final velocity of...

"The equations given for static and kinetic friction are empirical laws that describe the behavior of the forces of friction. While these formulas are very useful for practical purposes, they do not have the status of mathematical statements that represent general principles (e.g., Newton’s...

I think I just made an extremely stupid assumption here that because I only know what momentum I *want* it to be rather then what it *will* be, I can't use final momentum. I am honestly sorry for this. the only other constraints/goals I can think of are that the shooter itself should be able...

I'd say hypothetical, I want to understand how they work (in order to be able to build one if needed but still mainly understand) this is a bit tricky because like I said, I am mainly trying to understand the general usage rather then a specific case. but since you asked, here is a somewhat...

the problem in general is "given certain projectiles and the wanted parameters for how to shoot them, pick a wheel set up" rather then "given certain projectiles and wheel set up determine the parameters" I am aware (or at least think I am) of how the moment of inertia of the wheel and the...

I don't recall being giving instructions on how to solve my problem, I was told that the overall momentum/KE of the system will remain the same but that isn't my problem. the problem isn't how given a wheel's initial state and wheel+projectile final state to find the energy transference but...

yes that makes sense, but that also means that the contact area of the wheel with the projectile just doesn't really matter, so with a linear shooter for example if i had another pair of wheels (that rotate at the same velocity as the original 2) it will do nothing if not harm the projectile...

pretty much yes, the gravity part of your description I am not sure, since the shooter usually "raises" the ball with it while in contact (so the release angle is where the ball starts from in the picture you shared but the ball starts from further down). during contact the ball usually rolls...

fair enough I am probably being unhealthily obsessed about the "sources". and sure, with the sushi plate it truly doesn't really matter. But with other examples such as the wheel and the projectile I just don't know what exact laws and equations are at play, and some things seem to contradict my...

I don't think I understand correctly what you mean, the projectile doesn't necessarily have to start while slipping against the wheel and then becomes static in relation to the wheel. and a faster wheel would push the ball out quicker, so contact time would be lesser.

yes that is a perfectly inelastic collision, which I somewhat understand (still weird how it exerts a force to counter attempted motion even if the suhi plate itself isn't exerting a force or being exerted a force on by something else) this model could somewhat work with 1 type of mechanism...

the problem is that it isn't truly, at least not at my level of understanding. since friction does not increase based on velocity and it isn't just a perfectly inelastic collision. the velocity that the wheel is spinning shouldn't at all determine the force exerted on an object, yet somehow it does.

in the article they mention that the model they use for friction does not work the same for objects at high velocities, do you have any source for me to read about high velocity affect on friction and what is considered high enough velocities? it seems like it might be the answer I am looking...

that's a pretty good explanation, I'll probably look around some more to make sure, but it workout intuitively, thanks.

my guess as to what is happening based on what I saw in similar systems is that the velocity of the contacting object (such as the wheel) coupled with friction exerts somehow exert a force on the object to accelerate/spin it. as for your formulas my problem is that I am trying to find out what...