Force pushes and pulls two blocks at an angle

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Homework Help Overview

The problem involves two blocks being pushed and pulled by a force of 23.52 N, with frictionless vertical contact surfaces and a coefficient of friction of 0.29 between the blocks and the horizontal surface. The objective is to determine the magnitude of the acceleration of the blocks.

Discussion Character

  • Exploratory, Conceptual clarification, Problem interpretation

Approaches and Questions Raised

  • Participants discuss creating free body diagrams for each block and using the sum of forces to find the resulting acceleration. Questions are raised about the forces acting on each block and how to calculate the net force in the x direction.

Discussion Status

There is an ongoing exploration of the forces involved, with some participants clarifying the vertical and horizontal components acting on the blocks. Guidance has been offered regarding the need to consider all forces in both directions, but no consensus has been reached on the specific calculations.

Contextual Notes

Participants note that the vertical components must add to zero and that the horizontal forces must equal the mass times acceleration. There is an acknowledgment of the complexity of the forces involved, particularly regarding the friction and angles.

gap0063
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Homework Statement


A force of 23.52 N pushes and pulls to blocks
as shown in the figure below. The vertical
contact surfaces between the two blocks are
frictionless. The contact between the blocks
and the horizontal surface has a coefficient of
friction of 0.29.
The acceleration of gravity is 9.8 m/s2
What is the magnitude a of the acceleration
of the blocks?
Answer in units of m/s2



Homework Equations


I know its the sum of Fy=N-mg=0 => N=mg
and the sum of Fx= -fk=max



The Attempt at a Solution


fk=ukN=> fk=20.4624
but I do not know how to plug in Fcostheta or Fsintheta and I know those need to be used somewhere

[PLAIN]http://img685.imageshack.us/img685/9849/006sl.png
 
Last edited by a moderator:
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Create a free body diagram for each block, and then use ∑F=manet to find the resulting acceleration.

What forces are acting on each block?
How can you use these forces to find the net force on the blocks in the x direction?
 
jhae2.718 said:
Create a free body diagram for each block, and then use ∑F=manet to find the resulting acceleration.

What forces are acting on each block?
How can you use these forces to find the net force on the blocks in the x direction?

On the first block in the y direction there is N and m1g
in the x direction there is fk and F...
On the second block in the y direction there is Fsintheta, N, and m2g
in the x direction there is fk and Fcostheta...

right?
 
gap0063 said:
I know its the sum of Fy=N-mg=0 => N=mg
The sum of the vertical components on each block must add to zero, but N and mg are not necessarily the only forces with vertical components.
and the sum of Fx= -fk=max
The sum of horizontal forces must equal max. What are the horizontal forces acting on this system?
 
Doc Al said:
The sum of the vertical components on each block must add to zero, but N and mg are not necessarily the only forces with vertical components.

The sum of horizontal forces must equal max. What are the horizontal forces acting on this system?

Thanks! figured out the other components!

Thank you for you're help on my other problems too you're a live saver
 

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