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Newton's third law states that if a body A exerts a force F on a body B, then body B will exert a force on body A of the same magnitude and type as force F but in the opposite direction.

This law is sometimes referred to as 'Every action causes an equal but opposite reaction.' This is NOT an accurate description of the law for the following reasons:

1. It does not imply that the forces have to be of the same type. (An object placed on the earth's surface experiences a reaction force but this is NOT the reaction to the weight since they are not of the same type).

2. It gives the impression that the two forces cancel each other since they are 'of the same magnitude but act in the opposite direction'. This is NOT the case, as is expressed clearly by the (true) law since the forces act on DIFFERENT bodies.

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