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mechanical equilibrium state where no change in motion occurs.

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the combination of all forces acting on an object is called the net force

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whenever the net force on an object is zero , the object is in mechanical equilibrium.

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Learn Online | Learn Equilibrium of Coplanar Force Systems

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4 3   Net Force, Equilibrium and Force Vectors

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Uploaded by Shiny Happy Physics on 2014-03-18.

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an object at rest will stay at rest unless acted on by an unbalanced force.

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an object in motion will maintain its speed and direction forever un less acted on by an unbalanced force

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an object in motion will slow down unless it is acted on by an unbalanced force in the direction of motion.

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Unbalanced forces and motion | Forces and Newton's laws of motion | Physics | Khan Academy

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since it is a VECTOR sum, you have to take direction into account.

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the NET FORCE is the vector sum of all the forces.

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when there unbalanced forces there is a NET FORCE.

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an object at rest stays at rest and object in motion stays in motion with speed and in the same direction unless acted upon by an UNBLANCED force.