#NEWTONS THIRD LAW OF MOTION PLUS#

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#NEWTONS THIRD LAW OF MOTION PLUS#

In other words, 10 kg plus 15 kg, which is 25 kg total mass. What should we use for ' ' in the equation? Since we are treating the whole system as a single object, we must add all the masses together. All forces pointing in the negative (-) direction will also be negative in the equation. Since we are treating the system as a whole, or as if it is moving as a single object, we will add up all the forces acting on each object.Īll forces which point in the positive (+) direction, as shown in the free body diagram above, will also be positive when put into the equation. The two tension forces, in this case, are an action/reaction pair they are equal in magnitude but opposite in direction. Therefore, the weight of the 10 kg block is 100 N, and the weight of the 15 kg block is 150 N.Īccording to Newton's third law, for every force there is an equal and opposite force. The weight of each block can be found using the equation: Also, choose a direction to be considered the positive direction (+) and a direction to be the negative direction (-).Įach block has two forces acting on it: weight and tension. Start by drawing a free-body diagram including all the forces acting on each object. Since the two blocks are connected by the rope of the pulley, they will have the same acceleration and we can treat them as a single system.

Newtons third law of motion