Question from our Lab today on Friction

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SUMMARY

The discussion centers on the derivation of the coefficient of rolling friction for a car moving down an inclined plane at constant speed, expressed as µ = tan(θ) - m2/(mc cos(θ)). Participants express confusion regarding the variables involved, specifically m2 and mc, and the overall concept of rolling friction. The need for clearer explanations from educators on this topic is emphasized, highlighting a common struggle among students in understanding the mechanics of rolling motion.

PREREQUISITES
  • Understanding of basic physics concepts, particularly forces and motion.
  • Familiarity with the equations of motion on inclined planes.
  • Knowledge of friction types, specifically rolling friction.
  • Ability to interpret and manipulate algebraic expressions involving trigonometric functions.
NEXT STEPS
  • Study the principles of rolling friction and its differences from sliding friction.
  • Learn how to derive equations of motion for objects on inclined planes.
  • Research the significance of the coefficient of friction in real-world applications.
  • Explore the role of mass distribution in rolling objects and its effect on friction.
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Students studying physics, educators seeking to improve their teaching methods on friction, and anyone interested in the mechanics of rolling motion and inclined planes.

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Homework Statement


Assuming that f=mu(N), show that the cofficient of (rolling) friction for the
car moving down the inclined plane with a constant speed is given by
mu=tan(theta) - m2/mc cos(theta)(Use symbols, not numbers.)


Homework Equations





The Attempt at a Solution


Can someone explain any of this so I can understand what they are asking.
I can't get started because I don't really understand it.
Thanks,
Kevin
 
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rolling

Hi Kevin! :smile:

(have a mu: µ and a theta: θ :wink:)
Husker70 said:
Assuming that f=mu(N), show that the cofficient of (rolling) friction for the
car moving down the inclined plane with a constant speed is given by
mu=tan(theta) - m2/mc cos(theta)(Use symbols, not numbers.)

Can someone explain any of this so I can understand what they are asking.
I can't get started because I don't really understand it.

hmm … fair point! :biggrin:

I wish professors would explain rolling more carefully. :rolleyes:

Before I go any further, can you say what m2 and mc are (I can guess what θ is :wink:), and show us a bit more of the question? :smile:
 

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