Calculating Forces and Friction in a Two-Block System with a Spring

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SUMMARY

This discussion focuses on calculating forces and friction in a two-block system with a spring, specifically a 30 kg block on a table with a 15 kg block on top. The spring constant is 325 N/m, with a coefficient of kinetic friction of 0.600 between the lower block and the table, and a coefficient of static friction of 0.900 between the two blocks. The applied force F is designed to maintain constant speed for the blocks, requiring an understanding of the equations F = kx, Fk = usmg, and Fs = usmg to solve the problem effectively.

PREREQUISITES
  • Understanding of Newton's laws of motion
  • Knowledge of spring mechanics and Hooke's Law
  • Familiarity with friction coefficients and their applications
  • Ability to solve equations involving forces and motion
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This discussion is beneficial for physics students, educators, and anyone involved in mechanics, particularly those tackling problems related to forces, friction, and spring dynamics.

Leata
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Homework Statement



a 30 kg is restin on a flat horizontal table. on top of this block rests a 15 kg block, to which a horizontal spring is attached, as shown in the drawing. the spring constant is 325N/m. the coefficient of kinetic friction between the lower block and the table is 0.600, and the coefficient of static friction between the two block is 0.900. a force F is applied to the lower block. this force is increasing in such a way as to keep the the blocks moving in a constant speed

Homework Equations


F=kx
Fk=usmg
Fs=usmg


The Attempt at a Solution


im clueless don't know where to start. please help guys
 
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Welcome to PF!

Hi Leata! Welcome to PF! :wink:

Show us what you've tried, and where you're stuck, and then we'll know how to help! :smile:

(oh, and what is the spring attached to?? :confused:)
 

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