12-2-08

At the beginning of class today Mr, Manning instructed us to complete page 8, we picked this up at the beginning of class. This worksheet focused on what is an action-readtion pair and what is not. An action-reaction pair can only occur when two objects are acted on. this can be confused with balance forces that only include one object rather than two. Many action-reaction pairs are pictured here: (when writing action-reaction pair do not change the verb just switch the nouns) Earth pulls on apple Apple pulls on earth

Apple pushes on table Table pushes on apple

Table pushes on earth earth pushes on table

We proceeded to look over problems that were on the board. One described a tug of war with a larger mass person pulling on one side and smaller on the other. the question was which exerted more force on the rope. The answer is they both exert the same amount of force becasue of newtons third law

When two people of equal mass 6 meters apart attempt a tug of war on a frictionless surface, One ties the rope around her waste and does not pull on the rope while the other pulls. Who will slide farther. They both will slide the same distane because Newton says if one pulls they both pull.

If every action produces equal and opposite reacton hence creating a net force of 0, then how does something accelerate? (ex. horse and buggy) Only external forces can cause acceleration, so as long as the horse pulls with more force than friction it will accelerate.
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scott
 * protractor and ruler due tomorrow***