Class Friday October 22

Class on this day discussed mostly about rotational motion of a system.

Lecture:

Lecture in class we discussed about the pro and cons between low profile wheels and to thicker tires. Of course when we have lower profile tires the rims would be greater and therefore heavier and thus makes a car slower. Compared to a car with smaller rims and more tire the car goes faster because of the lighter weight and also because the radius of the wheel is smaller there fore requiring less force to spin. The moment of inertia of a single particle is also found to be just the product of its mass times the radius of that particle. The similarities with this compared to center mass is that in moment center mass it is MR however in inertia it is MR^2. we also had a demonstrations of different circular objects racing down a incline slope. The winner of the race was the solid circular because according to the equations of calculating the speed of the object at the bottom of the ramp we find that the values of c is smallest meaning it has the greatest speeds. The list of the order should follow as any solid sphere, any solid cylinder, any thin-walled hollow sphere, then any thin -walled hollow cylinder. We also discussed about problems of how to derive the moments of inertia of different objects such as sphere, cylinders, rods and it is important to note because the quiz on Friday will be based on those derivations.

Project:

We discussed what we should have by the end of the week and those include the need of having our planets in place and also have the launch. The need of having met up your groups are important because by this Friday which is tomorrow he is expecting to have our systems launch out from earth to at least the moon and to be within its orbit. If possible from there find into the mars orbit as well.

LAB:

During lab we had to make a video of one complete rotation by using a set of rotational apparatus that spins a horizontal beam on a stand. we draw then two dots on the beam and by making it visible we record data by using logger pro to capture the points of both circle that are plotted out then we analyze the differences in the graphs that were projected by the two dots.