question archive In a free-body diagram you see an object and all the forces acting on that object
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In a free-body diagram you see an object and all the forces acting on that object.
1)What are free-body diagrams?A free-body diagram displays an object taken in isolation with all the forces that act on that object.
2)What are they used for?They help us eliminate all the distractions (external elements) and focus ourselves on the objects alone. Free-body diagrams make the examination of objects and all the forces acting on those objects easier.
You can read the whole article and see examples here: What a free-body diagram is and how to draw it