Newton's law of motion -- crates & strings & friction

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SUMMARY

The discussion centers on applying Newton's laws of motion to a scenario involving three boxes connected by strings, with a constant speed of 2.0 m/s. Participants clarify that at constant speed, the acceleration (a) is indeed zero, which implies that the net force acting on the system is also zero. To determine the forces involved, it is essential to analyze the frictional forces acting on each box through free body diagrams (FBD). This approach allows for the calculation of forces despite the absence of acceleration.

PREREQUISITES
  • Understanding of Newton's laws of motion
  • Knowledge of free body diagrams (FBD)
  • Familiarity with static and kinetic friction coefficients
  • Basic algebra for solving equations
NEXT STEPS
  • Study the application of Newton's second law (F = ma) in various contexts
  • Learn how to construct and interpret free body diagrams (FBD)
  • Research the effects of static and kinetic friction on motion
  • Explore the concept of net force and equilibrium in physics
USEFUL FOR

Students studying physics, educators teaching mechanics, and anyone interested in understanding the principles of motion and forces in connected systems.

HTT
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Homework Statement


three boxes connected by strings.
given the mass of each box, coefficient of static and kinetic friction, and a constant speed of 2.0 m/s

I want to know how to get force by a given speed...!
Also, at a constant speed, how do I get to know the acceleration? does a = 0? if a = 0, how can I find Forces?

Homework Equations



F = ma

The Attempt at a Solution

 
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HTT said:

Homework Statement


three boxes connected by strings.
given the mass of each box, coefficient of static and kinetic friction, and a constant speed of 2.0 m/s

I want to know how to get force by a given speed...!
Also, at a constant speed, how do I get to know the acceleration? does a = 0? if a = 0, how can I find Forces?

Homework Equations



F = ma

The Attempt at a Solution


Start this kind of problem by drawing a free body diagram (FBD) of each of the crates. Be sure to show the frictional forces... that is how you can have a force even when the net acceleration is zero...
 

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