12-1+Nick+Sizemore

Today in class Mr. Manning first went around the class and checked the homwork. After this, we reviewed the homework as a class, Mr. Manning went over a series of scenarios that showed how Newton's third law works. One of the scenarios had to do with tug of war. There were two people on an ice surface with zero friction. The people were different weights, but they moved the same distance. For another example, Mr. Manning had Bridget push on Ryan while he was standing on a book that was wrapped in a paper towel. Even though Ryan had a higher mass, Bridget was able to push him off of the bood because he had less friction underneath him. Then, Mr. Manning had another scenario (shown below) that had a force scale attatched to a 100N weight at each end. He did a survey of the class to see what we thought it weighed. The choices were 100N, 200N, and 0N. Most people chose zero Newtons, but the correct answer was 100N. this is because the scale is only measuring the one side. The final example that Mr. Manning showed the class was a clip about a horse cart to show that only external, not internal, forces can case it to accelerate. Then, he gave us the last ten minutes of class to work on problems on page 9.