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- Homework Statement
- I have the solution I just want to know the intuition behind it,

So you have a frictionless box being pulled by two people. The first person has a rope connecting them and the box, the second has a rope that goes from the first to the second and lastly a rope that goes to the machine that pulls the rope. Draw the resulting free body diagrams for each one.

- Relevant Equations
- F=ma

For the box I understand it’s just normal and force of gravity as well as tension pulling them, it was declared to have no friction so it just points up down and right. It’ll be accelerating right.

The second person again has the normal force, gravity and the tension going to the left as a result of pulling the box. This is where I get confused, why is the friction in the direction of the tension of the third person pulling the first person? Is it because they are pushing off the ground?

Lastly the same thing would apply to the last person.

I’m having a hard time trying to understand why, we haven’t gotten far in my fundamental physics on friction mostly just basic principles, so that may be why but any help on why this is the case is greatly appreciated!

The second person again has the normal force, gravity and the tension going to the left as a result of pulling the box. This is where I get confused, why is the friction in the direction of the tension of the third person pulling the first person? Is it because they are pushing off the ground?

Lastly the same thing would apply to the last person.

I’m having a hard time trying to understand why, we haven’t gotten far in my fundamental physics on friction mostly just basic principles, so that may be why but any help on why this is the case is greatly appreciated!