Physics 30 - March 8

Today we started to look at specific types of forces.  We began with an examination of the force of gravity.  This is also called an object's weight, although not to be confused with an object's mass.  The one lesson I wanted students to learn today is that mass and weight do not mean the same thing.  Mass is a measure of the amount of matter an object has whereas weight is the force of gravity on that object.  One is measured in kilograms, the other in newtons.

We learned about the differences between weight and the normal force and also learned what exactly a bathroom scale is measuring.  The concept of apparent weight is really important for students to understand.  This was all covered on slides 36 to 42.  Students were given some time to work on Assignment 2.4 at the end of class, which we will take up tomorrow.

Physical Science 20 - March 8

Yesterday students wrote the quiz on the mole and then had the remainder of class to work on their lab reports for Lab C2.  Today we started into stoichiometry.  Students learned about molar ratios today and spend time figuring out different molar ratios for some examples.  At the end of class I assigned Homework C23, which looks at calculating molar ratios.  Tomorrow we will look at some gravimetric stoichiometry.

There is a new powerpoint that I am using for stoichiometry.  It is called Stoichiometry Notes and it is found the Notes folder of the Chemistry unit.  Remember this is all in the Physical Science 20 Course Notes link along the right hand side of this webpage.  Today we covered slide 1-7.

Physics 30 - March 6

Hey everyone.  I haven't posted in a little while due to my absence from class on Thursday and Friday.  I will try catch everyone up with what we have been doing in class.

Thursday - students learned about Newton's Second Law of Motion.  We went through a couple of examples that outline the relationships that exist between mass, force and acceleration and then had time to work on Assignment 2.2.  This was covered on slides 22-31 in the Unit 2 Notes powerpoint.

Friday - students learned about Newton's Third Law of Motion, or the action-reaction law.  We learned about the implications of such an important law and how often we use this law and don't realize it.  Assignment 3.3 was given at the end of the class.

  

Monday - today in class we reviewed what the sub went over and we talked about some examples of good work for the Bulletin Board project.  After this, I let students have the remainder of class to prepare for the exam tomorrow.

Physical Science 20 - March 6

Hey Everyone.  Sorry for my extended absence.  I was away from class at a workshop on both Thursday and Friday so I will update what you should have learned those days as well as today.

Thursday - you went over one last molar conversion - from liters of a gas at STP to moles using the molar volume.  After this, the sub left the students some time to complete Homework C21.  This was covered on slides 36-41 of the Mole powerpoint.

Friday - you reviewed all the different molar conversions we have learned so far.  After a couple of examples, the sub assigned the even questions on Homework C22.  The examples were on slides 42-45 of the powerpoint.

Today - We reviewed what the sub did and then went ahead and did Lab C2 called the Art of Chemistry.  If you were away today, then please arrange a time to complete the lab at lunch.

Tomorrow students will be writing a quiz on the Mole and molar conversions.  To study, look at Homework C17, C18 and C19.

Physics 30 - March 1

We learned about Newton's First Law of Motion today, or the Law of Inertia.   After students took a couple of slides of notes (slides 16-17) we then looked at many different examples of inertia as well as a couple of interesting demonstrations of the first law.  There was no assignment that went along with this lesson.  Students can work on Assignment 2.1.  Tomorrow we will learn about Newton's Second Law of Motion.

Physical Science 20 - March 1

Today in class we learned how to do another type of conversion.  This one involved solutions and how to convert between liters of a solution and moles of the solute (the thing that is being dissolved).  This involved using the concentration of the solution you are working with - called the molarity.  We worked through two examples and then students had some time to work on Homework C20.  We will take this up tomorrow.  The notes for today we found on slides 23-29 of the Mole powerpoint.  Tomorrow we will learn our last conversion, from liters of a gas to moles.