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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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How is it possible to drive a nail into a piece of wood using a hammer?
See first of all there is no equal and opposite reaction also here the surfaces are not perfectly flat enough for example take a look on a tip of nail it’s pointed so here the geometry plays a key rol …