Shucks. All the pictures uploaded backwards. Anyway. Today Erika, Justin, and I worked on our physics journals at my house and on my hill. We focused mainly on work and potential and kinetic energy. I chose work because I wanted to set up my punching bag. As you can see in the bottom picture, Justin is struggling to hold up the 100 lb punching bag by himself. Even though he's having a LOT of trouble holding it up, he's not doing any work. Why not? Because work requires force and motion in the direction of the force. Because Justin is holding the punching bag in place, he's not changing the position at all, although he's getting tired, he's doing no work. In the second, third, and fourth pictures, Justin and I are raising the punching bag to hang it up onto the chains. We are doing work in these pictures because we are lifting the punching bag, therefore applying force and displacing the punching bag, changing its position. When we actually started punching the bag, we were using energy, another new concept we learned. When Justin and I punched the bag, the energy put into the punch did not simply disappear, it was absorbed by the punching bag and turned into a different form of energy. The law of conservation of energy states that energy is neither created nor destroyed. I'm not quite sure where the energy went, but because we're in physics I can confidently say that it must still exist!
Shucks. All the pictures uploaded backwards. Anyway. Today Erika, Justin, and I worked on our physics journals at my house and on my hill. We focused mainly on work and potential and kinetic energy. I chose work because I wanted to set up my punching bag. As you can see in the bottom picture, Justin is struggling to hold up the 100 lb punching bag by himself. Even though he's having a LOT of trouble holding it up, he's not doing any work. Why not? Because work requires force and motion in the direction of the force. Because Justin is holding the punching bag in place, he's not changing the position at all, although he's getting tired, he's doing no work. In the second, third, and fourth pictures, Justin and I are raising the punching bag to hang it up onto the chains. We are doing work in these pictures because we are lifting the punching bag, therefore applying force and displacing the punching bag, changing its position. When we actually started punching the bag, we were using energy, another new concept we learned. When Justin and I punched the bag, the energy put into the punch did not simply disappear, it was absorbed by the punching bag and turned into a different form of energy. The law of conservation of energy states that energy is neither created nor destroyed. I'm not quite sure where the energy went, but because we're in physics I can confidently say that it must still exist! 
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