Newton's Third Law
Simply put, Newton's third law states that for every action force, there is a simltaneous reaction force that is equal in magnitude but opposite in direction. When applying Newton's third law, the action and reaction forces will appear on seperate FBDs. They are not added together.
Using Newton's Laws- Kinematics
Tension always acts on the object directed towards the rope or string. It is uniform throughout the rope and pull with the same force at both ends. In order to use the 5 kinematics equations from Unit 1, acceleration must be constant. Kinematics can be used in forces because of the direct relation through F=ma. The 5 kinematics equations may be used to find variables like time, displacement, etc. when calculating a force problem.
Practice
1. https://docs.google.com/viewer?a=v&pid=sites&srcid=ZGVmYXVsdGRvbWFpbnxtcnRyYXNrc3BoeXNpY3N8Z3g6NGQwZjUwMDlhMjQ3MGZmNw (worksheet)
-https://docs.google.com/viewer?a=v&pid=sites&srcid=ZGVmYXVsdGRvbWFpbnxtcnRyYXNrc3BoeXNpY3N8Z3g6MzFiMzRhMDRmZThlMTZiMg (soultions)
2. http://www.stmary.ws/highschool/physics/home/marys_java/forces/3lawsReviewQ.html (review of newton's 3 laws)
Videos
1. http://dsc.discovery.com/tv-shows/mythbusters/videos/cartoon-law.htm (theory behind experiment [below] using newtons third law)
http://dsc.discovery.com/tv-shows/mythbusters/videos/cartoon-law.htm (see newtons third law in action)
-https://docs.google.com/viewer?a=v&pid=sites&srcid=ZGVmYXVsdGRvbWFpbnxtcnRyYXNrc3BoeXNpY3N8Z3g6MzFiMzRhMDRmZThlMTZiMg (soultions)
2. http://www.stmary.ws/highschool/physics/home/marys_java/forces/3lawsReviewQ.html (review of newton's 3 laws)
Videos
1. http://dsc.discovery.com/tv-shows/mythbusters/videos/cartoon-law.htm (theory behind experiment [below] using newtons third law)
http://dsc.discovery.com/tv-shows/mythbusters/videos/cartoon-law.htm (see newtons third law in action)