How to visualize the invisible forces acting on every object around you
In short: Forces are vector quantities describing pushes or pulls, but tracking them is difficult when multiple contact and non-contact forces act at once. This video explains how to use free-body diagrams to model these interactions, helping you calculate the net force acting on an object.
A free-body diagram simplifies complex physical interactions by representing an object as a single point, typically its center of mass. From this point, vector arrows are drawn to represent every external force acting upon it. These forces include contact forces like friction or the normal force, as well as non-contact forces such as gravity.
By isolating these individual vectors, you can determine the net force, which is the vector sum of all forces present. This modeling technique is a fundamental tool in physics for understanding how multiple simultaneous influences dictate an object's motion.
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Sources
- Summary by Intellect · source: Forces and free-body diagrams | AP Physics | Khan Academy
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