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Hi. Its Mr. Andersen and this AP Physics essentials video 43. It is on free-body diagrams which are what they sound like. It is essentially drawing a diagram of a body removed from its environment and all the forces that are acting on that. But before we draw some of those I want to give you a thought problem. Imagine we have a scale on a platform and you just simply stand on it. So we figure out your weight. What do you think would happen to your weight if we angled that platform? Is it going to remain the same? Are you going to weigh less? Are you going to weigh more? What if we make it even steeper? Well I tried this. I stood on a scale. And so this is my weight. And then I put it on a platform. And I used my iPhone to figure out that this is around a 17 degree angle. And you can see that my weight got less. And so that seems kind of magical. It would be a great way to lose weight. But what is really going on there, you have to draw a free-body diagram. So I am the object sitting