The force exterted and / or experienced by Tabitha's leg is an opposite reaction force equal to the amount of force she exerts when she pushes against the wall. This is explained further on Newton's third law of motion. Otherwise should the force she exerts on the wall overcomes the force of strength of the wall's resistance, the wall will break to the direction of tabitha's push.
No it's the quite opposite simple
10. A safe place to use the trebuchet would be away from other buildings and people. A good example of a place would be a large field with no nearby structures.
14. Many factors need to be kept consistent throughout the experiment. One example of a variable that would need to be consistent is the weight and size of the projectile.
15. It is important to do many trials so that you can make sure that the results of each trial are nearly the same. If they are all vastly different, then it means that something has gone wrong.
Sorry I was only able to answer a few questions, but I hope these few answers help! :)
Explanation:
it holds protons and neutrons together
