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Chapter 5 Applications of the Laws of Force and Motion 2011

# Chapter 5 Applications of the Laws of Force and Motion 2011...

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Chapter 5 Application of Laws of Force/Motion Last Time: square4 Electrical model Protons (+) Electrons (-) Electrons much less massive square4 Electrostatic force law square4 Electromagnetic interaction square4 What is a contact force? I have read chapter 5 A. Yes B. No Regarding Newton’s 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?

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Problem Analysis square4 When approaching a problem always ask about the roles of: Gravity (common) Charge (not as common) Contact forces, especially friction square4 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 square4 A scale measures the force of contact between you and the floor. If you are not accelerating, the contact force equals your weight. Moving in an Elevator square4 Forces are: balanced before starting (a), after stopping (e), and while gliding in uniform motion between floors (c). unbalanced upward when you start to move (b) unbalanced downward as you stop (d).
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Chapter 5 Applications of the Laws of Force and Motion 2011...

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