Before and After

I felt that it was necessary to write my blog about Thanksgiving. I'm sorry my videos are sideways :( Anyway, the video on the left is before, and the video on the right is after. The rest is pretty self explanatory. As you can see, after eating her delicious Thanksgiving dinner, my cousin is too full to do anything. In the second video, when my cousin lies down on the ground, her velocity becomes zero as does her acceleration. If I were to draw a free body diagram of her, the two forces would be mg, pointing down, and normal force, pointing up. They would be equal since the net force is zero. We should have weighed ourselves before and after to see how much the mg force increased by. My bet is 10 Newtons.

To relate this to chapter 14, when my cousin is standing up, like in the first video, the pressure she exerts on the ground is much greater than the pressure she exerts on the ground in the second video when she lies down. This is because the surface area of her feet in the first video is much smaller than the surface area of her body in the second video, and pressure=force/surface area.