# The wall and Newton's 3rd law

According to newtons third law or the law of conservation of momentum. When one body loses momentum the other gains the momentum. But what would happen in the following case?

A snooker ball hits the wall so the ball stops after hitting the wall so ideally the momentum of the ball should have been transferred to the wall but the wall stays still. So how does momentum get conserved?

• The wall did move ,its just that we did not noice. – Lapmid Feb 3 '17 at 10:45
• Lets gather some more info and then we could put the pieces together. As an example what if you wore skates and you held a ball and you threw the ball. Then you would be pushed back as you throw the ball forward but you would move only slightly. This is because you have a greater mass than the ball and so you have a lot of inertia. – avito009 Feb 3 '17 at 10:56
• @avito009 You just answered your own question. The earth has an immense mass so the motion that happened is negligible - but it IS there. In non rigid (non ideal) more realistic situations, you can take into account deformations, heat loss etc. as answers below are talking about. – Steeven Feb 3 '17 at 11:59
• – Qmechanic Feb 3 '17 at 12:27