Exploring the Earth's Center: Ball Drop Speed vs Distance Plot

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SUMMARY

The discussion centers on the theoretical scenario of dropping a ball through a drilled hole in the Earth, focusing on the speed versus distance plot. It is established that under the assumptions of no wind resistance, uniform density, and no Earth's rotation, the motion can be modeled as a mass-spring system derived from Gauss's Law for gravitational fields. The ball would initially accelerate towards the center, overshoot due to inertia, and then oscillate back and forth. This scenario is commonly explored in undergraduate mechanics courses.

PREREQUISITES
  • Understanding of Gauss's Law in gravitational fields
  • Familiarity with mass-spring systems in physics
  • Basic knowledge of kinematics and dynamics
  • Concept of uniform density in spherical objects
NEXT STEPS
  • Research the mathematical modeling of mass-spring systems
  • Explore the implications of uniform density on gravitational fields
  • Study the effects of oscillatory motion in physics
  • Learn about the assumptions in classical mechanics regarding ideal conditions
USEFUL FOR

This discussion is beneficial for physics students, educators in mechanics, and anyone interested in gravitational theories and motion dynamics.

Molydood
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If I drilled a hole all the way through the earth, and then dropped a ball down one end, what do you think the speed versus distance plot would look like?

I am interested in the centre point of the Earth primarily - instinct tells me it would overshoot by quite a bit, but how far?

assume no wind resistance
 
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Molydood said:
If I drilled a hole all the way through the earth, and then dropped a ball down one end, what do you think the speed versus distance plot would look like?

I am interested in the centre point of the Earth primarily - instinct tells me it would overshoot by quite a bit, but how far?

assume no wind resistance

And if other assumptions to be made include the Earth as a sphere with uniform density, no spinning, etc... then if you solve for the gauss's law equivalent for the gravitational field, you'll get a mass-spring system!

This is a common question in undergraduate mechanics course.

Zz
 

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