The weight of the books is acting on the table in a downward direction. Action and reaction act on different bodies.Action and reaction are opposite in direction.Action and reaction are equal in magnitude.Forces always occur in pairs (action and reaction forces).Newton’s 3rd law of motion tells us four characteristics of forces. Note that action and reaction forces act on different bodies. “To every action, there is always an equal but opposite reaction.”Īccording to this law, the action is always accompanied by a reaction force and the two forces must always be equal and opposite. The force exerted by body A on B is the action force whereas the force exerted by body B on A is called the reaction force. Let body A exerts a force on another body B, body B reacts against this force and exerts a force on body A. Newton’s 3rd law of motion deals with the reaction of a body when a force acts on it. See Also: Newton’s first law of motion examples Newton’s Third law of motion definition Newton’s 3rd law This is the cause or essence of Newton’s 3rd law of motion. Only a strong force can reduce the speed of the hammer, thus Newton said that the two objects must be treated on an equal basis, such as the hammer exerts a force on the nail and the nail exerts a force back on the hammer. It is true because, in the example of hammer and nail, the hammer exerts a force on the nail, but the nail exerts a force back on the hammer as well, due to this the speed of the hammer rapidly reduced to zero. But the question is that where do these forces come from? We noticed during observations that a force on any object is always exerted by another object.īut Isaac Newton realized that things are not one-sided. Newton’s third law of motion explains quantitatively how forces affect motion. In all these examples a force is exerted on one object and that force is exerted by another object. Common examples of Newton’s third law of motion are: A horse pulls a cart, a person walks on the ground, a hammer pushes a nail, and magnets attract paper clips. Newton’s 3rd law of motion states that action and reaction are always equal but opposite in direction.
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