Do work!

Hey guys, another week conquered in AP Physics! If any of you are wondering, I'm not totally failing, yet! :) So this past week was about doing work! Not just any kind of work, but physics work, which is the product of displacement and the force in the direction of displacement. In other words, the amount of energy put into by a force in order to move an object. Now take a look at the picture above. In this case, the object is Julia's head and my fist is the force. (Don't worry guys, nobody was harmed during this photo session.) To find the amount of work done, you'd multiply the force of my fist times the displacement of my fist as is travels to Julia's head times cosine of the angle at which my fist comes into contact with her head. Another component to consider in this scenario would be the kinetic energy, or the energy of motion, of Julia's head in response to me punching it. The kinetic energy would be equal to half the product of the mass of her head and its velocity squared. Check this out, if you found the change of kinetic energy of Julia's head, that'd be equal to the work done by me: another strategy of computing work! Don't try this at home. Start simple, like moving a book or a chair. Do work.