Unit 6

Today's class was again like another math class. We focused on newtons second law, law of acceleration which states Fnet=mass x gravitational force. We went through multiple problems involving newtons second law. I learned that force and acceleration have a direct relationship and that mass and acceleration have an inverse relationship.  The first problem went over consisted of a "pulley," which changes direction of our force. The pulley had two weights attached at the ends and because of this we had to draw out two diagrams. Drawing a diagram is the first step that we learned we must do in any problem like this. The second step is finding the acceleration of the system. The acceleration of both diagrams is the same because they are attached by the same string. The third step is to choose oen mass to find T. The tensions of the two masses are the same because they are attached by the same string.
Next we went over elevator problems. For these problems we had to draw a diagram, and from this diagram we figured out our equations. Another thing that I learned to class today is that there is no normal force when the object is not touching a surface, that is why for one of the elevator problems when the cable suddenly broke, the force of the floor on the man in the elevator was 0 because there is no normal force when there is no surface.