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

AI Thread Summary
To calculate the force P needed to lift a 200kg crate with a static friction coefficient of 0.3, the friction force from the B wedge on the crate surface must be determined first. The normal force, influenced by both the weight of the crate and the applied force P, is crucial for solving the problem. The discussion highlights the challenge of having more unknowns than equations, complicating the calculation process. Ultimately, the solution involves applying the equation μS x Fn = Fk to find the necessary values. The conversation emphasizes the importance of identifying the correct forces at play to solve for P effectively.
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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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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