Force

Subject: Science

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Force is an external agency which changes or tends to change the state of a body from rest to motion or vice versa.
When a number of forces acting on a body do not change its states of rest or uniform motion in a straight line, the force are said to be balanced forces.
When a number of forces acting on a body change its state of rest or uniform motion in a straight line, the forces is said to be unbalanced forces.