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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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Why am I not accelerated by the reaction force applied by Earth on me?

To you, lets apply the second law. As it states, actually $\sum F=m a$ NOTE THE SUMMATION, which means the resultant force applied. If you're just sitting or not moving, both normal force and gravity …
YiFei's user avatar
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1 vote

If the force of friction is 20 N for a moving body does acceleration increase with the incre...

How the acceleration change may depends on the relation between the two bodies' mass and the coefficient of friction of the surfaces. I will assume the initial friction is exerted by ground. In the f …
YiFei's user avatar
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