This is not a homework problem rather it is a discussion that I have been having with friends. *Your thoughts and feedback would be appreciated.(adsbygoogle = window.adsbygoogle || []).push({});

1. The problem statement, all variables and given/known data

Blocks A and B are on a horizontal surface and connected to one another by a load cell.

Block A has mass m1 and Block B has mass m2.

Each block has difference coeff of static and dynamic friction.

Load cells are connected to the left and right of the blocks.

A right horizontal force F1 is applied to the*

All blocks accelerate at the same rate.

The applied force is much greater than the frictional force.

Diagram

-(#)- = load cell

-(1)-A-(2)-B-(3)-

Questions.

1) What are the forces at each load cell.

2) Assume that the system eventually hits a wall but F continues to be applied. *What are the forces a each load cell after impact.

-(1)-A-(2)-B-(3)-WALL

3. The attempt at a solution

1)*

The force at location (1) is:

u1*N1+u2*N2

Where u represents friction coeff and N is normal force.

The force at location (2) is:

u2*N2

The force at location (3) is simply zero.

In the case where*

The force at location (2) is*

2)*

Once we hit the wall we have a change in the reactionary forces.

The reactionary forces cancel out and the force throughout the entire chain is F.

Position 1 is F, position 2 is F, position 3 is F.

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# Homework Help: Connected blocks on a surface with friction

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