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

In summary, the conversation discusses the force required to pull two similar wooden blocks tied together on a level surface. The force needed to pull them at constant speed is F, and if one block is stacked on top of the other, the new force required will be approximately equal to the original force. The equations used are f = μN and F = f, and the tension force must also be taken into account.
  • #1
utkarshakash
Gold Member
854
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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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  • #2
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:
 
  • #3
Thanks. I just got my answer.
 

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

What is the friction problem with wooden blocks?

The friction problem with wooden blocks is that they tend to stick together when stacked or rubbed against each other, making it difficult to slide or move them.

Why do wooden blocks have a higher friction compared to other materials?

This is because of the rough and uneven surface of wooden blocks, which creates more surface area for contact and therefore increases the friction.

How can friction between wooden blocks be reduced?

One way to reduce friction between wooden blocks is by using a lubricant such as oil or wax on their surfaces. Another way is to apply a force in the direction opposite to the motion, which can help break the bonds between the blocks and reduce the friction.

How does the weight of the wooden blocks affect the friction?

The weight of the wooden blocks has a direct impact on the friction between them. As the weight increases, the normal force between the blocks also increases, resulting in higher friction.

Can changing the temperature affect the friction between wooden blocks?

Yes, changing the temperature can affect the friction between wooden blocks. As the temperature increases, the molecules in the blocks vibrate more, causing them to expand and creating more space between the blocks. This reduces the surface area for contact and therefore decreases the friction.

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