Calculating Coefficients of Friction with an Inclined Eraser

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SUMMARY

The discussion focuses on calculating the coefficients of static and kinetic friction using a rubber eraser on an inclined plane. The eraser begins to slip at an angle of 35.2° (indicating static friction) and moves at a constant speed at an angle of 30.8° (indicating kinetic friction). The coefficients can be determined using the formula f = μN, where N = mgcos(θ). The static friction coefficient is derived from the angle at which slipping begins, while the kinetic friction coefficient is derived from the angle at which constant speed is achieved.

PREREQUISITES
  • Understanding of basic physics concepts, specifically friction.
  • Familiarity with inclined plane mechanics.
  • Knowledge of force diagrams and equilibrium conditions.
  • Proficiency in using the formula f = μN for friction calculations.
NEXT STEPS
  • Calculate the static friction coefficient using the angle of 35.2°.
  • Calculate the kinetic friction coefficient using the angle of 30.8°.
  • Explore the concept of equilibrium in inclined planes.
  • Learn how to draw and interpret force diagrams in physics problems.
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Students studying physics, particularly those focusing on mechanics and friction, as well as educators looking to enhance their teaching methods regarding inclined planes and friction concepts.

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Homework Statement



In order to determine the coefficients of friction between rubber and various surfaces, a student uses a rubber eraser and an incline. In one experiment, the eraser begins to slip down the incline when the angle of inclination is 35.2° and then moves down the incline with constant speed when the angle is reduced to 30.8°. From these data, determine the coefficients of static and kinetic friction for this experiment.
FIND: Static and Friction

Homework Equations



f=mu(N)

The Attempt at a Solution


N=mgcos(theta)
 
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What seems to be the problem? You haven't really shown any attempt at solving the problem.
 
Well i guess I am just confused on the following: I know that static friction is bigger and requires more force than that of friction force. The angles seem to indicate that the Static is 30.8 and friction is 35.2 is that right?
 
piercegirl said:
In one experiment, the eraser begins to slip down the incline when the angle of inclination is 35.2° and then moves down the incline with constant speed when the angle is reduced to 30.8°.

When does static friction apply? When does kinetic friction apply?

Draw a force diagram. Is the motion in equilibrium?
 

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