Calculating Force P to Lift 200kg Crate: A Challenge!

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SUMMARY

The discussion focuses on calculating the force P required to lift a 200kg crate, considering a static friction coefficient of 0.3 across all contact surfaces. The key equation used is μS x Fn = Fk, where μS represents the static friction coefficient and Fn is the normal force. Participants emphasize the importance of determining the friction force from the wedge moving on the crate surface and finding the normal force, which is influenced by both the weight of the crate and the applied force P. The challenge lies in managing the number of unknowns in the equations.

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  • Understanding of static friction and its coefficient
  • Familiarity with normal force calculations
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mike41
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Homework Statement



Determine the force P required to like the 200kg crate. Coeff. Static friciton is 0.3 on ALL contact of surfaces. Neglect Wedge Mass

Prob.8-66.jpg


Homework Equations



μS x Fn = Fk
Summation of forces eqns

The Attempt at a Solution



im getting more unknowns than equations
see attachment.
 

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  • wedges.jpg
    wedges.jpg
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You should be able to get the friction force due to the B wedge moving on the crate surface quite easily. Do that first!
For the next surface down, can you find the normal force? Both the weight of the crate and the P force contribute to it.
 
haha ofund it actually. muFN = Fk so uu only have 2 variables. gah well thanks anyways
 

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