Why Can't SHM Explain a Ball Falling Through Earth's Radius?

Click For Summary
SUMMARY

The discussion centers on the limitations of Simple Harmonic Motion (SHM) in explaining the behavior of a ball dropped through a hole that extends through the Earth's radius. Participants highlight that SHM is applicable only for small displacements where the restoring force is linear, represented by F(x) = kx. When the displacement becomes comparable to the Earth's radius, higher-order terms in the force equation become significant, invalidating the SHM approximation. The conversation emphasizes the need to consider uniform density and the implications of larger displacements in such scenarios.

PREREQUISITES
  • Understanding of Simple Harmonic Motion (SHM)
  • Familiarity with force equations and linear approximations
  • Knowledge of gravitational forces and uniform density concepts
  • Basic grasp of higher-order terms in physics
NEXT STEPS
  • Study the implications of higher-order terms in force equations
  • Explore gravitational potential energy in non-linear systems
  • Investigate the effects of varying density on gravitational forces
  • Learn about oscillatory motion in different physical contexts
USEFUL FOR

Physics students, educators, and anyone interested in the complexities of gravitational motion and the limitations of classical mechanics in real-world scenarios.

Kolahal Bhattacharya
Messages
133
Reaction score
1
We all know that a ball when dropped into a straight hole through the earth, it begins shm.The question I want to raise here is we know that SHM happens when displacement is very small so that F(x) depends only on the linear term kx and not on the higher order terms:x62, x63 etc.Here the displacement is very big, may well be compared to The Earth's radius.where I am going wrong?
 
Physics news on Phys.org
What higher order terms are you talking about? In the usual "ball dropped through a hole through the Earth" problem, we assume a uniform density and small hole, so that F(x) = kx throughout the motion.
 

Similar threads

Replies
14
Views
3K
  • · Replies 6 ·
Replies
6
Views
3K
  • · Replies 5 ·
Replies
5
Views
3K
Replies
40
Views
9K
Replies
7
Views
2K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 13 ·
Replies
13
Views
3K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 9 ·
Replies
9
Views
3K
  • · Replies 11 ·
Replies
11
Views
2K