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You can choose your language settings from within the program. This article is about linear momentum. This article is about momentum in physics. Since momentum has a direction, it can be used to predict the resulting direction and speed of motion of objects after they collide. Below, the basic properties of momentum are described in one dimension. The unit of momentum is the product of the units of mass and velocity.
Being a vector, momentum has magnitude and direction. The momentum of a system of particles is the sum of their momenta. Suppose, for example, that two particles interact. Because of the third law, the forces between them are equal and opposite. This law holds no matter how complicated the force is between particles.
Similarly, if there are several particles, the momentum exchanged between each pair of particles adds up to zero, so the total change in momentum is zero. Newton’s apple in Einstein’s elevator. In person A’s frame of reference, the apple has non-zero velocity and momentum. In the elevator’s and person B’s frames of reference, it has zero velocity and momentum. To someone inside the elevator, the apple does not move, so, it has zero momentum. Thus, momentum is conserved in both reference frames.
Moreover, as long as the force has the same form, in both frames, Newton’s second law is unchanged. Forces such as Newtonian gravity, which depend only on the scalar distance between objects, satisfy this criterion. A change of reference frame, can, often, simplify calculations of motion. For example, in a collision of two particles, a reference frame can be chosen, where, one particle begins at rest. In this frame, the total momentum is zero.