What Is the New Pulling Force When Wooden Blocks Are Stacked?

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When two wooden blocks are stacked and pulled across a surface with friction, the force required to pull them at constant speed changes due to the increased normal force. The frictional force, calculated using f=μN, increases as the weight of the stacked blocks adds to the normal force. If the blocks are connected by a string, tension must also be considered in the force calculations. The discussion highlights the importance of understanding the forces acting on each block to determine the new pulling force. Ultimately, the new force required to pull the stacked blocks will be greater than when they are pulled side by side.
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Homework Statement


Two similar wooden blocks are tied one behind the other and pulled across a level surface. Friction is not negligible. The force required to pull them at constant speed is F. If one block is stacked upon the other then the new force required to pull them at constant speed will be approximately ?

Homework Equations


f=μN
F=f

The Attempt at a Solution


I can't understand if they are connected by a string or something else. If a string is present then I will have to apply a Tension force. If they are just simply connected by some other means then the contact force has to be taken into account. By either way I am not able to get the answer.
 
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welcome to pf!

hi utkarshakash! welcome to pf! :smile:

suppose the two blocks have mass m (each), the coefficient of kinetic friction is µ, and the tension is T …

since the acceleration is 0, what are the equations for the forces on the two blocks? :wink:
 
Thanks. I just got my answer.
 

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