See the Mechanics area of the Edexcel A-level specification – sections 6-9, pages 34-37 of this document. We can see Newton’s third law at work by taking a look at how people move. This means that we assume that the string has negligible weight, it doesn’t stretch or have friction with the pulley. Newtons third law of motion states that whenever a pair of objects interact, the force from the first object on the second object is equal in magnitude and. Newton’s third law of motion says whenever one body exerts a force on a second body, the second body exerts a force that is equal in magnitude and opposite in direction on the first body. Examples 3 and 4 involve a light inextensible string over a smooth pulley. In addition, we assume that an object is a particle with the same weight acting at a single point. In Examples 1 and 2 objects in contact with one another are treated as connected particles. Newton’s Third Law in Connected Particles If multiple objects are connected and are acting in the same straight line, they can be treated as a single object.Ĭlick here to revise Newton’s First Law and Newton’s Second Law of Motion. Conversely, resistance from the trailer exerts an equal and opposite force on the vehicle. The trailer has the same acceleration as the vehicle and is pulled forwards by the tension in the tow bar. By way of example, consider a vehicle that is accelerating and pulling along a trailer. Note that the same can also be said for accelerating objects. It follows that, since the object doesn’t move, the ground exerts an upward reactive force on the object equal in magnitude. You can see Newton’s Third Law of Motion in action by observing an object resting on the ground (Note that the upward force is that of the ground pushing upward on the object and the downward force is that of the object pushing downward on the ground).Īs you can see, the downward force exerted on the ground by the object is the object’s mass m multiplied by gravity. Newton’s Third Law of Motion – ACTION and REACTION are equal and opposite. Newton’s Third Law of Motion says that if two bodies are in contact with one another then the force exerted on body B by body A is equal in magnitude and opposite in direction to the force exerted on body A by body B.
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