A discussion of sound and light being waves, with sound requiring a medium for transmission while light does not require a medium was illustrated by the bell and vacuum jar demonstration. The definition of a vibration, a wave, period of a wave, frequency of a vibration and the units of frequency were presented. A demonstration showing that the period of a pendulum is due to the length of the string and not the mass attached was performed, with the results agreeing with the hypothesis

From the definition of the bouyant force,an upward force exerted by a liquid on a submerged object, the following statements were derived. The deeper an object is, the greater the bouyant force, and a submerged object will displace a volume of water equal to its volume. The apparent weight of an object submerged in water was shown mathematically to be equal to the weight in air minus the weight in water, which is the bouyant force. An example was used to determine the apparent weight of a 3N object in air. This principle was then shown in the lab using a 100g mass, a cylinder of water and a spring scale. From the density of water, and the density found for an object, it was determined whether that object would sink or float, and tested in the lab.

I guided Marcel through the solutions of several problems in the topic of power. He correctly set up and solved the problems with minimal guidance. We checked in the lab for materials that could be used to demonstrate concepts such as mechanical energy, power, and work. There was no assignment.

Marcel and I reviewed the conservation of energy problems. We then began the physics of power. We reviewed a practice problem using the definition of power and then worked together to solve one problem and started another. We didn't finish before our time was up. There was no assignment.

Lab to determine the density of water, and using Archimedes principle to determine if an object will sink or float.

Using the definition of pressure as force/area and the force being the weight of liquid on the area of the bottom of the container, and weight being the mass x the acceleration due to gravity, led to the fact that the pressure of the liquid depends on the gravity, density and depth. The density of a liquid was related to the weight of the liquid compared to the weight of an equal volume of water. Mercury, with a density of 13.6, exerts 13.6 times the pressure on the bottom of a container as does an equal volume of water. ( density of 1). The apparent loss of weight was related to the bouyancy of the object in the liquid. The bouyant force was shown to be the NET upward force exerted on an object by a fluid. Archimedes principle was defined using the bouyant force on a immersed object being equal to the weight of the fluid it displaced. Assignment: textbook questions from 3 chapters to be handed in on Thursday

I reviewed the law of conservation of mechanical energy with Marcel. I showed him how any object with mass has both kinetic energy and potential gravitational energy. I then showed him how to analyze and solve a problem dealing with changing potential and kinetic energy. After finishing that problem, I let Marcel set up a different but related problem. When he got an incorrect answer, I told him that he needed to rework the problem for homework and do one additional problem.

I introduced the topics of gravitational and elastic potential energy. I demonstrated to Marcel how the zero point for gravitational energy has to be established and that the amount of stretch or compression of an elastic element is what is measured in the calculations. We worked together to solve two problems in that topic. There was no assignment.

The determination of liquid pressure being due to density, gravity, and depth was presented, and the fact that the pressure was a factor of the depth and not the volume shown using liquid demonstrations. The total pressure on an object immersed in a liquid was shown to be the liquid pressure plus the atmospheric pressure. A cup with holes at varying distances from the bottom was used to show how the water was shot from the holes at different velocities due to the location on the cup. Bouyance and the bouyand force were explained, with the bouyant force being the net upward force on an object. Archimedes principle was stated as the the bouyant force on an immersed object being equal to the weight of the fluid displaced by the object.

Marcel and I reviewed problems from the assignment about work. I then introduced kinetic energy and the net work - change in kinetic energy equivalence. Then, we did some selected problems in that topic. There was no assignment.