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A dock worker pulls two boxes connected by a rope on a horizontal floor, as shown in Figure $4.37 .$ All the ropes are horizontal, and there is some friction with the floor. Make a free-body diagram of each box.

see solution.

Physics 101 Mechanics

Chapter 4

Newton's Laws of Motion

Physics Basics

Motion Along a Straight Line

Motion in 2d or 3d

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but he was supposed to do a person pulling a 8 15 unit, a 7 50 Newton box tied together by ropes. This person is exuding some type of horizontal force. They're pulling it, so we have some force pulling to this right direction. So if you want to do free by diagram, perspective boxes Oh, and this rope here there exists attention between them, and this is not a frictionless surface. So, for let's do a so for a well, I'm afraid to raise my stuff down there, and I apologies. Here's my for this is for a I have the mass of a You know, that's a mass in this mass, it's being tugged. Well, it has downward force. 850 Nunes. That's this weight. It has a responding normal force. It has the force taking its right, which is the tension between a and B along that rope, and that has a negative force. And that is the friction on A. So you have the friction on a the normal force. That's a day, yeah, and the normal force. Because there is no other vertical components playing a rule. It's normal forces, actually, just the magnitude of it is also equal to 8 50 because it ah because it's going to be We have an equilibrium between up between the up and down the box snuffling Corbett, I don't think we need that for the strong rooms can stick with it being normal. Um, the main point of free by diagrams is to have all your forces labeled. So you have understand this is the weight. Okay. And then for blue Well, for blue, it has its different mass because it also has a different weight. And we could find that mask gonna bother again. You can also find out what the normal vector is just the same magnitude. But I'm not worried about these details because just trying to draw the letters. This is supposed to be a B. To remind you that blue is be, um we had the Ford Force of the pool of the person in the back. We had the friction of be, plus the tension between a and B because both are pulling backwards. The tension tree means bullet backward. And there's also a friction between A and B. They're not between Just be a friction. I'll be and so, yeah, these are negative forces, affection on the intention. Positive, for it's just the force from the person and those.

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