I Marble spiralling inside a cylinder- New video

  • I
  • Thread starter Thread starter A.T.
  • Start date Start date
  • Tags Tags
    Cylinder Marble
AI Thread Summary
A new video related to an old discussion on marble spiraling inside a cylinder has sparked interest, particularly regarding basketball shots that bounce off the rim. Observers noted that a basketball can appear to rotate around the rim before either falling through or bouncing out, with some suggesting that the center of gravity may dip below the rim during this process. Steve Mould's follow-up video explores this phenomenon using a bouncing ball as a model for rolling in a cylinder. Participants in the original thread are encouraged to revisit the discussion for further insights. The connection between the new video and the previous physics concepts enhances understanding of these dynamics.
Physics news on Phys.org
Huh, very interesting!

Sometimes when I'm shooting basketball hoops, my shot will be off-center but inside the hoop. If it catches the rim just right (just wrong?), I can see several rotations around the inside of the rim before the ball finally falls through or gets spit back out. Several times I could have sworn that the center of gravity of the basketball was below the plane of the rim before it got shot back out, and maybe this video shows an explanation of why that can happen. It will still be frustrating to miss like that, but at least now I'll know why...
 
Reply
  • Like
Likes Swamp Thing, A.T., Drakkith and 1 other person
A.T. said:
Steve Mould made a follow up video
With a contributing video from you, which inspired this one, if I may add ;).
 
Thread 'Gauss' law seems to imply instantaneous electric field propagation'

Thread 'Gauss' law seems to imply instantaneous electric field propagation'

Imagine a charged sphere at the origin connected through an open switch to a vertical grounded wire. We wish to find an expression for the horizontal component of the electric field at a distance ##\mathbf{r}## from the sphere as it discharges. By using the Lorenz gauge condition: $$\nabla \cdot \mathbf{A} + \frac{1}{c^2}\frac{\partial \phi}{\partial t}=0\tag{1}$$ we find the following retarded solutions to the Maxwell equations If we assume that...
View full post »
Thread 'Griffith, Electrodynamics, 4th Edition, Example 4.8. (First part)'

Thread 'Griffith, Electrodynamics, 4th Edition, Example 4.8. (First part)'

I am reading the Griffith, Electrodynamics book, 4th edition, Example 4.8 and stuck at some statements. It's little bit confused. > Example 4.8. Suppose the entire region below the plane ##z=0## in Fig. 4.28 is filled with uniform linear dielectric material of susceptibility ##\chi_e##. Calculate the force on a point charge ##q## situated a distance ##d## above the origin. Solution : The surface bound charge on the ##xy## plane is of opposite sign to ##q##, so the force will be...
View full post »

Thread 'Simple thought experiment with Stefan-Boltzmann law: energy'

Dear all, in an encounter of an infamous claim by Gerlich and Tscheuschner that the Greenhouse effect is inconsistent with the 2nd law of thermodynamics I came to a simple thought experiment which I wanted to share with you to check my understanding and brush up my knowledge. The thought experiment I tried to calculate through is as follows. I have a sphere (1) with radius ##r##, acting like a black body at a temperature of exactly ##T_1 = 500 K##. With Stefan-Boltzmann you can calculate...
View full post »

Similar threads

Marble spiralling inside a cylinder
Replies
40
Views
11K
I Involuted planes within a circle, Klingelnberg-Palloid involute
Replies
13
Views
1K
B Intermediate Axis Theorem - Intuitive Explanation
Replies
1
Views
1K
I Work in hydrostatic system in cylinder with piston: P_int or P_ext?
Replies
5
Views
2K
What's the trick to this "perpetual" marble device?
Replies
9
Views
1K
What is the electric field inside an infinite cylinder?
Replies
7
Views
3K
I Atmospheric Density vs Altitude in an O'Neil Cylinder
Replies
1
Views
3K
I How Does Changing Mass and Spring Force Affect Watch Oscillators?
Replies
11
Views
2K
Path of the end of a string wrapping around cylinder
Replies
5
Views
3K
B Strange spiral structure in Oort Cloud, outer Solar System
Replies
2
Views
1K

Hot Threads

Recent Insights

Back
Top