Today, I did three experiments, all related to his laws of motion. The first one explained that "The change in motion of a body is proportional to the strength and direction of the applied force", which is Newton's second law of motion.
First, I attached a bungee cord to a cup, and measured how long the bungee cord stretched.
It was 5 1/4 inches. Next, I added 25 ml of water. The bungee cord extended to 5 3/8 inches. I added 25 more m of water. The bungee cord extended to 5 1/2 inches. Finally, I added another 50 ml, totalling 100 ml of water. The bungee cord measured 6 inches, 3/4 inches longer then it started.
This simple experiment proves that the more force that is applied to an object, the greater the force of the reaction will be.
You can see some pictures of it below. (You can't really tell the difference between them, but when I measured it, there was definitely a change in the bungee cord.)
For my second experiment, I did one that showed friction in action, and how it interacts with other forces. Newton's first law of motion states "A body persists its state of rest or of uniform motion unless acted upon by an external unbalanced force." For the experiment I conducted today, I first took a coin and put it on a piece of paper. Next, I placed the paper over a cup so the coin was directly above the opening, but on top of the paper. If I pulled the paper slowly, the coin would move with it. However, if I jerked it quickly, then the coin would stay in place, and fall into the cup. I took a video of it, which I have posted below.
When I pull the paper slowly, the friction in between the coin and the paper is greater than the coin's inertia, which results in the coin moving along with the paper. However, when I pull the paper quickly, the force of me pulling the paper is greater than the force of the friction, and the coin stays where it was, dropping into the cup. This is proving Newton's first law of motion.
You can learn more about this here.
For my third and final experiment, I conducted a very interesting one. It involved Newton's third law of motion, which is "To every action there is an equal and opposite reaction."
There is an interesting invention, called Newton's Cradle, which demonstrate's this law. It works because the force of one ball striking the group is enough to move a ball equal to it's own weight. Also, the force of two balls is enough to move two balls, equal to their own weight, and so on and so forth.
I made a simple version of this, involving marbles and a box. You can see a video of a large Cradle below.
