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Unformatted text preview: Chapter 5 Application of Laws of Force/Motion Last Time: s Electrical model Protons (+) Electrons (-) Electrons much less massive s Electrostatic force law s Electromagnetic interaction s What is a contact force? I have read chapter 5 A. Yes B. No Regarding Newtons Laws A) I understand what they are and how to apply them B) I understand what they are but I had difficulty following what was in Ch. 5 C) I have difficulty understanding what the three laws are D) Who was Newton? Problem Analysis s When approaching a problem always ask about the roles of: Gravity (common) Charge (not as common) Contact forces, especially friction re the forces balanced or unbalanced? s Are the forces balanced or unbalanced? Acceleration is only and always in the direction of the unbalanced force. The direction of acceleration and velocity are often not the same. Standing on a Scale s A scale measures the force of contact between ou and the floor. you and the floor. If you are not accelerating, the contact force equals your weight. Moving in an Elevator s Forces are: b a l a n c e d before starting (a), after stopping (e), and while gliding in uniform motion between floors (c)....
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- Winter '08