PHY 110 Lecture 02 - Interactions And Systemsx - PHY 110 Conceptual Physics Lecture 02 Interactions And Systems Lecture Created By Andrew N Sumerel

PHY 110 Lecture 02 - Interactions And Systemsx - PHY...

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Lecture 02: Interactions And Systems Lecture Created By: Andrew N. Sumerel Based On Conceptual Physics 12 th Edition By: Chapter 5: NEWTON’S THIRD LAW OF MOTION PHY 110: Conceptual Physics
How is Newton’s Law Of Motion considered for multiple objects?What can objects do to eachother?How are interactions quantified?Can interactions describe motion?To what situations do these considerations apply?Are there relevant and familiar examples? Interesting Questions To Answer In This Lecture 2
Forces And Interactions Interactions And Motion Systems Relevant Topics For Answers 3
Forces exist when one object does something to another object. So an interaction requires a pair of forces acting on two different objects . Example: interaction of hand and wall involves a force pair You push on the wall. The wall pushes on you. interaction of truck and train How does the train’s force compare to the truck’s force? Term Definition Forces And Interactions 4 Click Me During Slideshow!
Newton’s Law Of Interaction (Traditionally Newton’s Third Law) Whenever one object exerts a specific force on a second object, the second object exerts a force on the first that: is the same kind of specific force, is equal in magnitude but is opposite in direction. In equation form: Physical Relationship Forces And Interactions 5 1 on 2 2 on 1 F F
Force pairs during an interaction are co-acting. Neither force exists without the other. always act on different objects. are always the same kind of force. are equal in strength but opposite in direction. These nontrivial notions are missing from the common, alternate form of this law: For every action there is an equal but opposite reaction. Procedural Remarks Forces And Interactions 6
Examples The push here is really the force of friction For these examples, we may feel confident in defining an action and a reaction, but in most situations this characterization is impossible. The Law Of Interaction does prefer one force over another so ignore the idea of action/reaction. Forces And Interactions 7

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