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With the embedded molecular dynamics model, you can easily drop atoms into the simulation box and study simple particle dynamics. By playing with this example, you will observe Newton's Third Law. You will see that when two atoms collide, the forces on them point to opposite directions. You may observe the rarer three-body collision events. How can you explain the forces on three colliding particles using the Third Law? (You need to know about vectors.)
Newton's Third Law: Forces always occur in pairs. If object A exerts a force on object B, then object B exerts an equal and opposite force (-F) on object A. In other words, every action has an equal and opposite reaction.
When two particles collide, the forces upon them will be equal and opposite.
Additional Related Concepts