Same lesson outline as Mon. and Tue.

Refer to Monday's lesson outline.

I worked with Marcel to supervise his solution to the last problem on the practice test on forces and motion. I then gave him a copy of my test. The 7 test questions are similar to the problems on the practice test and include one bonus problem. Topics for problems include forces applied at angles and on inclined planes, friction forces, acceleration, and resultant forces. There was no assignment.

I continued to work with Marcel on practice test questions from my test on motion and force. Question topics included forces on inclines, friction, weight, and vectors. Marcel was able to finish all but the last problem, which he will finish during our next class. There was no assignment.

The physical characteristics of solids, distinct shape and volume was discussed using examples. The crystalline structure of crystal solids was demonstrated with microphotographs and actual microscopic slides. The concept of density as a ratio of mass/volume reviewed, with actual densities determined on a wood block and a metal block of the same dimensions. The affect of temperature and pressure on density was examined using ice and liquid water. The actual density of water was determined at the room temperature by measuring the mass of a given volume. The term specific gravity was related to the density of a substance compared to the density of water.

A reinforcement of the physics of circular and elliptical orbits was undertaken. It included the rate of curvature of the Earth, the effect on a projectile accelerating straight up at a given speed, how to place the projectile into orbit, the orbits formed at close Earth orbit and far Earth orbit, the potential and kinetic energy at varied points on the orbit in both circular and elliptical orbits, the laws of Keppler, and the escape velocity needed from Earth.

I guided Marcel through the solution of the first problem on the practice test dealing with friction and forces at angles. We also started work on a problem where static friction on an inclined plane was involved. The assignment was for Marcel to continue working on the practice test.

Marcel worked through a problem with two perpendicular forces accelerating an object with different amounts of acceleration. He had to use the second law of motion and kinematic equations. We also discussed a lab experiment that we are planning after the upcoming test. The purpose would be to experimentally determine the coefficient of static friction. We also experimented with stroboscopic effects and how they can be used to analyze motion. There was no assignment.

Using 2 push pins and string , the different orbitals formed when the foci are close together or far apart was sketched. A close orbit was circular while a more distant orbit was elliptical. Reviewing the definitions for kinetic energy and potential energy, the relationship between PE and KE at the apogee and perigee as well as mid points between was discussed and concluded that the PE was equal at all points and that the sum of the PE and KE was a constant. This was then compared to an elliptical orbit sketched, with the differences in energy noted at the same four points as on a circle. The change in both KE and PE was explained as well as the effect gravity has on the change in KE as the satellite orbits.

Marcel and I worked on a problem requiring the calculation of the resultant vector given 4 forces in different directions and also worked on a problem with force, mass, and a final velocity given. Marcel found the acceleration and the amount of time to reach the final velocity. There was no assignment.