Yesterday in class we 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. I assigned Assignment 3.3 at the end of the class.
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 3.4 at the end of class, which we will take up tomorrow.
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