What is balance and unbalanced forces. Give examples.
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For example, when an apple hangs from a tree, the weight of the apple is balanced by the force exerted by the branch on the apple. When an object is moving with changing speed, the net force on it is unbalanced.
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When two forces are the same strength but act in opposite direction, they are called balanced forces. Again, tug-of-war is a perfect example. If the people on each side of the rope are pulling with the same strength, but in the opposite direction, the forces are balanced. The result is no motion.
Forces that cause a change in the motion of an object are unbalanced forces.
If you push against a wall, the wall pushes back with an equal but opposite force. Neither you nor the wall will move.
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