We finished our discussion on Archimedes, particularly his results on buoyancy and an experiment like the "gold crown affair". We covered topics like "weight in water" versus "weight in air", measuring mass (with a balance) versus measuring weight (with a scale) as well as obtaining the volume of an object by measuring the water it displaces. These led us toward a means to determine the density of a material.

We also considered the changes that would arise in our scenario if the object is less dense than the fluid and hence floats. Here the weight and buoyant force are equal, but the volume of the object and the volume of the water displaced are not equal.

We started our discussion of Galileo. We started with his improvement of the telescope and his use of it for atronomical observations. This led to ideas like the moon was not a perfect sphere and that the planets revolved around the sun (Copernicus' heliocentric theory as opposed to Ptolemy's geocentric theory) which started in part with Galileo observing the moons of Jupiter. These ideas put Galileo in conflict with the church.

We then turned to Galileo's ideas on falling bodies -- how they have constant acceleration and how ideally (in the absence of air resistance) that all the bodies near the surface of the earth would have the same acceleration. These ideas put Galileo in conflict with Aristotle or more to the point his followers. We ended by watching Feather & Hammer Drop on Moon.