Friday is Happy Day!

B block reviewed their rotational dynamics exams and then moved onto their buoyancy homework problems. That took a bit more time than expected and we took the safe course of working on a few more before moving on to new material. On Monday, we'll start off by looking at these additional buoyancy problems before moving onto fluid pressure.

C Block checked over their pressure problems and then took a look of how fluid pressure varied with depth in the fluid column. Atmospheric pressure is highest at ground level since all the layers of the atmosphere pushing down on your head. As you rise, there is less mass, therefore weight on you, so the pressure diminishes. The same is true when you descend in the ocean. And because objects are 3-dimensional, the pressure on the bottom of the object is larger than the pressure on top of the object, ensuring a net upwards force. There is the origin of the fluid's buoyant force... we'll go over your homework problems on Monday and then tackle the topic of fluids in motion.

E Block investigated Archimedes Principle. For a completely submerged object, the buoyant force is basically constant. But, as you progressively submerged the object, the buoyant force increased as the volume of the displaced fluid increased. Have your write-up ready for Monday, as well as your buoyancy problems to review before we move on to fluid pressure.

F Block reviewed their buoyant forces lab and the associated lab questions and then, after reviewing the buoyancy homework, moved onto fluid pressure. Fluids exert pressure on objects in them and on their containers. For a closed system, if additional pressure is added to the system, it is transmitted equally in all directions in the fluid - Pascal's Principle. We discussed how this applied to hydraulic devices and worked a few problems in class with a hydraulics device. You have a few more to work for homework and we'll go over these on Monday before moving on to looking at how fluid pressure varies with position in a fluid column.

Have a great weekend!