It is frequently the case that one of the objects moves as a result of the force applied but the motion of the other object in the opposite direction is not apparent. How does the horse-cart system mo...It is frequently the case that one of the objects moves as a result of the force applied but the motion of the other object in the opposite direction is not apparent. How does the horse-cart system move if the cart pulls on the horse with the same exact force and in the opposite direction as the horse pulls on the cart? (Beware, there are many misconceptions related to this example!
This is the key result that allows us to treat extended objects as if they were particles: as far as the motion of the center of mass is concerned, all the internal forces cancel out (as we already sa...This is the key result that allows us to treat extended objects as if they were particles: as far as the motion of the center of mass is concerned, all the internal forces cancel out (as we already saw in our study of collisions), and the point representing the center of mass responds to the sum of the external forces as if it were just a particle of mass M subject to Newton’s second law, F=ma.
