Oct. 26-30

On monday, we got into a dicussion about whether or not objects can stop without slowing down. For homework, we watched a video, and it showed bullets in slow motion hitting a piece of bullet proof metal. With the slow motion, we were able to see that the bullet did slow down before coming to a complete stop. The front of the bullet would get smooshed when it hit the surface, and while it was getting smooshed, it slowed down. This shows that objects do slow down before they stop. This would be good to know if you were driving a car because you would know to slow down down before you reach a stop sign.

We were also looking at how different motions look on a graph with time on the x-axis and position on the y-axis. If something was a constant speed, the trend line would be straight. If the speed was increasing, the line would be curving, and it would become more vertical. If the speed was decreasing, the linewould also be curved, but it would be getting more horizontal. The graph could also show objects going in a negative direction/postion (backwards). Those graphs would have the trend lines going down. Knowing about the types of graphs is important because we use them to show the motions of the objects.

On Friday, we played around with some motion sensor kind of thing that sent out waves and made a graph of it. When the line increased, it meant that we were getting farther away, and when it decreased it meant that we were getting closer. Once we understood how it worked, we tried to make graphs that looked a certain way. This is important because now we know how to get away from Batzilla.