Force attracting a particle and time required

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SUMMARY

The discussion focuses on calculating the time required for a particle of mass m, released from rest at a distance b, to reach the origin under the influence of a force described by the inverse square law, F(x) = -kx-2. The conclusion derived is that the time taken for the particle to reach the origin is given by the formula T = π(mb3/8k)1/2. The solution involves applying the principle of mechanical energy conservation to derive the relationship between position and time.

PREREQUISITES
  • Understanding of classical mechanics, specifically Newton's laws of motion.
  • Familiarity with the inverse square law of attraction.
  • Knowledge of mechanical energy conservation principles.
  • Ability to solve differential equations related to motion.
NEXT STEPS
  • Study the derivation of the inverse square law in gravitational and electrostatic contexts.
  • Learn about mechanical energy conservation and its applications in particle motion.
  • Explore solving differential equations in physics, particularly those involving motion under variable forces.
  • Investigate the implications of the derived time formula in practical scenarios, such as orbital mechanics.
USEFUL FOR

This discussion is beneficial for physics students, educators, and anyone interested in classical mechanics, particularly those studying motion under central forces.

LazyMan
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Homework Statement


A particle of mass m is released from rest a distance b from a fixed origin of force that attracts the particle according to the inverse square law:
F(x) = -kx-2

Show that the time required for the particle to reach the origin is
Pi times (mb3/8k)1/2


Homework Equations


I have no idea what you need


The Attempt at a Solution


I am sad to say I have no clue how to even star this one. Any help would be nice, just don't give me the answer just yet.
 
Physics news on Phys.org
Use energy mechanical energy conservation and solve for dx/dt. After you do that you might see what comes next.
 

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