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- [Instructor] Lets say we have some type of hard, flat, frictionless surface right over here. Thats my drawing of a hard, flat, frictionless surface. And on that, I have a block, and that block is not accelerating in any direction. It is just sitting there. And lets say we know the weight of that block. It is a 10-newton block. So my question to you is, pause this video, and think about what are all of the forces that are acting on this block? All right, now lets work through this together. And to do it, Im going to draw whats known as a free-body diagram to think about all of the forces. And the reason why its called a free-body diagram is that we just focus on this one body. And we dont draw everything else around it, and we just draw the forces acting on it. And theres actually two typical ways of drawing a free-body diagram. Ill do them both. So first, I could draw it this way. So this is my block here. Now, I told you that it weighs 10 newtons. The weight of an object,