Solving the Kinetic Friction and Tension of Two Blocks

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SUMMARY

The discussion focuses on solving a physics problem involving two blocks, A (5 kg) and B (2 kg), connected by a massless rope over a massless pulley. The blocks are moving down a 30-degree incline at constant velocity, requiring the calculation of the coefficient of kinetic friction and the tension in the rope. Key equations used include the kinetic friction formula (fk = ukN) and the application of Newton's second law. Participants emphasize the importance of free body diagrams to visualize forces acting on the blocks.

PREREQUISITES
  • Understanding of Newton's laws of motion
  • Knowledge of free body diagrams
  • Familiarity with the concepts of kinetic friction and tension
  • Basic trigonometry for resolving forces on an incline
NEXT STEPS
  • Study the derivation of the coefficient of kinetic friction in inclined planes
  • Learn how to construct and analyze free body diagrams for multi-body systems
  • Explore the application of Newton's second law in dynamic systems
  • Investigate the effects of different angles of incline on tension and friction
USEFUL FOR

Students studying physics, particularly those focusing on mechanics, as well as educators looking for examples of problem-solving techniques in dynamics.

mooney82
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Homework Statement


Block A (M1-5 kg) is on a horizontal surface and block B (M2-2 kg)to the left resting on a 30 degree incline. the two are connected to each other by a mass-less rope over a massless pulley and are moving down hill (to the left) at constant velocity.

a) Find the coefficient of kinetic friction assuming it is the same for both blocks.
b) The tension of the rope


Homework Equations


fk=ukN


The Attempt at a Solution


I found -fk=M1*a and substituted that into the first equation of 5sin(30)-fk=ma. I'm not sure if I'm even starting this right or not, a gentle nudge in the right direction would be most appreciated.
 
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mooney82 said:

The Attempt at a Solution


I found -fk=M1*a ...

You are omitting one of the forces acting on the mass. Did you draw a free body diagram ?

Another hint: from reading the problem statement, we know that a=____?
 

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