What Frequency Causes a Rock to Lift Off a Vibrating Platform?

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SUMMARY

The discussion centers on determining the frequency at which a small rock begins to lose contact with a vibrating platform oscillating with an amplitude of 10.4 cm. The key equation involved is the acceleration equation ax(t) = -w^2 * Asin(wt), where w represents angular frequency. Participants emphasize the need to find the frequency that results in zero reaction force on the rock, indicating it has just begun to lift off the surface. The problem is likened to rollercoaster dynamics, highlighting the relationship between amplitude and frequency in oscillatory motion.

PREREQUISITES
  • Understanding of oscillatory motion and acceleration equations
  • Familiarity with angular frequency (w) and its relationship to frequency (f)
  • Knowledge of forces acting on objects in motion, particularly normal and gravitational forces
  • Basic principles of harmonic motion and its applications
NEXT STEPS
  • Study the relationship between amplitude and frequency in harmonic motion
  • Learn how to apply Newton's laws to oscillatory systems
  • Explore rollercoaster physics to understand forces at play during vertical motion
  • Investigate the concept of resonance and its effects on physical systems
USEFUL FOR

Students in physics, particularly those studying mechanics and oscillatory motion, as well as educators seeking to explain the dynamics of vibrating systems.

aubailey
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Homework Statement


A vibration platform oscillates up and down with an amplitude of 10.4 cm at a controlled variable frequency. Suppose a small rock of unknown mass is placed on the platform. At what frequency will the rock just begin to leave the surface so that it starts to clatter?

Homework Equations


ax(t) = -w^2 * Asin(wt)

The Attempt at a Solution


I know I need to find the acceleration with the given amplitude but i still have two variables, omega and time in order to find that. Can anyone point me in the right direction?
 
Last edited:
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welcome to pf!

hi aubailey! welcome to pf! :wink:

what is your basic equation, the one that determines whether the rock loses contact (ie the reaction force is zero)? :smile:
 
Yes, how do I find the frequency that will cause the rock to be lifted a little?

i suppose it is similar to a rollercoaster problem but I am kind of stuck because I am only given the amplitude.
 

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