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A pictorial device which analyzes forces present on any body with the use of vectors. Allows easier grasping of problems involving either objects at equilibrium or in motion. Can be used to predict presence of forces.

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Action Reaction when I pushing a trolley?

The action reaction forces operate on different bodies. If you push a trolley, it pushes on you. The sum of the forces will still be zero, but it will be a different kind of zero, because the trolley …
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How can acceleration $a$ be zero when applied force $F$ is non-zero?

Friction is the kind of situation you must take into account. Apparently, you have not yet overcome static friction, which prevents an object from moving. ma is the sum of the forces, and if the sum o …
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