Sequence Information Sequence: dynami-6-Newton 3 law_english Description: Keywords: physics, 3rd newton's law
Run time: 1h
Delivery Mode: in class or for students study
Outline of Activities: teaching Newton's 3rd law of motion with examples
Audience: Middle school Subjects: Physics Language: English LAMS Version: 2.5.0. License: Attribution-Noncommercial-ShareAlike Support Files: No files Sharing with: Everyone in Public Status: Active Average Rating: (5). Based on 2 reviews. Number of downloads: 4 times Number of previews: 12 times Authored By: giorgos fakiolakis Date: 02 November 2015 04:13 PM User Comments on dynami-6-Newton 3 law_english sequence
dynami-6-Newton 3 law_englishI like the video with the examples about the action-reaction forces and especially the example with the measuring of our weight on the scales.
But I have two main objections:
a) The force is a vector quantity and when two vectors have the same measure , and opposite directions they are called opposite. So the action - reaction forces are exerted on different bodies but they are opposite forces because they are vectors.
b) The vector sum of the action - reaction forces is zero, their resultant is not zero when we are interested for the resultant of one body's forces. When we are interested for the resultant of the two bodies system's forces the resultant of the action - reaction forces is zero (intrinsic forces).