The discussion revolves around the dynamics of a block on a frictionless incline and the implications of lowering a bowling ball on a scale. Participants explore concepts related to momentum conservation and the effects of external forces on the system.
The discussion is active, with participants raising questions about the assumptions made regarding the normal force and momentum. Some guidance has been offered regarding the implications of lowering the bowling ball, but there is no explicit consensus on the correct interpretation of the forces involved.
Participants are considering the effects of quickly lowering an object on the normal force measured by a scale, which introduces complexities in the analysis of the system's dynamics.
Doc Al said:What external forces act on this system?
Sure about that? (Consider what happens to the center of mass of the system.)ritwik06 said:and the normal reaction from the ground which is equal to the weight of the to bodies.
Doc Al said:Sure about that? (Consider what happens to the center of mass of the system.)
It's not.ritwik06 said:That means momentum is created in the y direction. and the there is no net force in the y direction. How is this possible?
Yes, that's wrong.Yes, I think that the normal will also be equal to (M+m)g . Is it wrong?
ok.Doc Al said:It's not.
Yes, that's wrong.
Nope the reading must not be constant. This would mean that I can't take the incline and block as one system. Then how will I figure out the magnitude of th normal?Doc Al said:Example: Stand on a scale while you hold a bowling ball. The normal force (scale reading) will be (M + m)g. But what if you quickly lower the ball? Will the normal force remain constant?