When the first friend throws the ball towards the second friend, the ball exerts a force on the first friend in the opposite direction to the throw. In accordance with Newton's third law of motion, the first friend also exerts an equal and opposite force on the ball. As a result, the first friend experiences a recoil force that causes them to move backwards, while the second friend moves forward slightly as they catch the ball. The magnitude of the recoil force depends on the mass of the ball and the speed at which it is thrown. However, the effect on the overall position of the two friends is negligible, as the distance between them is much greater than the distance they move due to the ball throw. Thus, the activity will not cause any significant change in the position of the two friends.