Covering New Ground

Honors Physics had a test today and the homework assignment that drops you into the wonderful world of radians. For some of you, the the initial discussion of the unit circle and the relationship between radians and degrees will be a review. For others, this may be new - regardless, you will be using radian values for angle measurements and for then reporting values describing angular motion. Note: when you look through this and the following chapter, you may feel overwhelmed by what seem to be a whole suite of new formulas. Relax. You've seen them before, only wearing their translational cape. Pick each formula in Chapters and 8 apart and you find that it is the same as one we've used before, only with the angular equivalents of the variables. Here's a little video about the Unit Circle, for those who might need a review:



Physical Science - remember that forces are still the only things that can cause changes in motion, so when you discuss floating and sinking, discuss it in terms of the object's weight and the buoyant force of the fluid. Today's density discussion described that property of matter and your homework problems will give you some practice calculating density. However, density does not make something float or sink - density determines the objects weight for its size and the buoyant force of the fluid for the displaced volume. Regardless, it all comes back to forces and we'll tie these ideas together tightly tomorrow. For you, here's a video about density and buoyancy:



Physics - tomorrow's lab will have you review the concept fo 2-dimensional motion and vectors and use them to analyze momentum. It is easy to forget that momentum is a vector quantity when all the collision we study occur in one dimension. Refresh your mind about horizontal projectile motion, as that is what will occur after the collision in lab takes place and how to add vectors to find the resultant.