Can You Measure Terminal Velocity in a Classroom Experiment?

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SUMMARY

This discussion focuses on measuring terminal velocity in a classroom experiment, specifically using Stokes' Law. The key equation presented is F = 6πrηv, which describes the resistive force on a sphere moving through a medium. The challenge identified is determining when terminal velocity is reached, as it requires balancing the weight of the sphere with the resistive force and upthrust. The discussion also references a helpful resource for further understanding the concepts involved.

PREREQUISITES
  • Understanding of Stokes' Law and its application in fluid dynamics
  • Familiarity with the concepts of terminal velocity and forces in equilibrium
  • Basic knowledge of viscosity and its role in fluid mechanics
  • Ability to perform experiments and collect data accurately
NEXT STEPS
  • Research methods for accurately measuring terminal velocity in various mediums
  • Explore the impact of temperature and density on viscosity in experiments
  • Investigate alternative experimental setups for observing Stokes' Law
  • Learn about data analysis techniques for interpreting experimental results in physics
USEFUL FOR

Students studying physics, particularly those preparing for OCR Physics A A2 levels, educators designing classroom experiments, and anyone interested in practical applications of fluid dynamics.

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Homework Statement



I am putting forward this plan for discussion, in the hopes that it will be helpful for myself and others also doing this for their ocr physics A A2 levels.

The task is a planning exercise where you must write a plan for the investigation of Stokes' law.
I welcome the addition of new questions to this thread and discussion about this plan.
My particular questions about this, at this time is whether it is possible to measure terminal velocity of a ball baring in a class experiment? The problem i forsee in measuring this, is knowing when terminal velocity is actually reached, and recording this. The ball can be in air or any medium.


Homework Equations



Stokes law : F=6πrηv

F= the resistive force experienced by the sphere as it travels through the medium
r = radius of sphere
η = the coefficient of viscocity of the medium, which can be treated as a constant, unless the temperature or density of the medium changes.
v= the velocity of the sphere

When traveling at terminal velocity, the weight is balanced by the resistive force and upthrust, leading to the equation:

v = kr² where k can be considred as a constant,
such that k = 2(ρs - ρm)g / 9η

where ρs = density of sphere, and ρm = density of medium
g = gravity

The Attempt at a Solution


 
Physics news on Phys.org
http://www.ugrad.physics.mcgill.ca/labs/Reports/Sample1.htm

great site lots of info and ideas.

and it can really help you get your head around it if you don't get it.
 
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