A while ago, my friends (Shantha and Lauren) and I got the opportunity to swing on swings! We hadn't done that in a long time so we pretty excited and we got our other friend, Kelsey, to take pictures. haha yeah. So swinging on swings could be an example of many physics problems, especially energy, in the form of a pendulum. When we first sat on the swing, we had zero kinetic energy and zero potential energy. As we swung and "pumped" our legs to get higher, we gained both kinetic and potential but at different times in the pendulum. At the peaks of the motion, we would have a high potential energy but zero kinetic energy. As we accelerated towards the ground, our kinetic energy would increase as the potential energy decreased.

collisions

Sooo last weekend I forgot to make an entry so I'm doing 2 tonight. Over the summer my friends and I went to Bayfest at the Marine Corp Base the night Three Days Grace was playing. And because it was Three Dyas Grace, there was a mosh pit...which consists of momentum and collisions! In the mosh pit people were running into us and getting thrown and shoved into us. These collisions were bouncy collisions; sometimes the other person and I were both in motion going towards eachother when we collided and other times, I was standing still when someone collided into me. I didn't get a picture of the actual mosh pit because that wouldn't be safe for my camera but here's a picture of us when we were standing in the crowd waiting for Three Days Grace to come on.

About a week ago my friends and I ended up staying late after school and we really didn't want to do homework so we went around taking pictures. My friend, Kelsey, wanted me to get an action shot of her jumping out of a tree. I held up the camera concentrating on when to click it so that I caught her while she was in the air. I snapped the picture and I was still focusing on my camera to see how it came out when less than a second later I heard hug BOOM. I looked down and Kelsey was on the ground cracking up and grabbing her feet in pain. I didn't excatly see what happened but apparently when she jumped to the metal bench below the tree, there was not enough friction between the bench and her feet so she slid off and gravity brought her to the ground. I'm glad she was ok because it was soooo funny. Unfortunately, lacking in photo skills, I didn't really get a good picture.