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Chapter 6 Newton’s Third Law of Motion- Action and Reaction

Chapter 6 Newton’s Third Law of Motion- Action and Reaction. Conceptual Physics Hewitt, 1999. 6.1 Forces and Interaction. Interaction- mutual action of two objects Required for a force to occur You can’t touch without being touched. 6.2 Newton’s Third Law.

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Chapter 6 Newton’s Third Law of Motion- Action and Reaction

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  1. Chapter 6Newton’s Third Law of Motion- Action and Reaction Conceptual Physics Hewitt, 1999

  2. 6.1 Forces and Interaction • Interaction- mutual action of two objects • Required for a force to occur • You can’t touch without being touched

  3. 6.2 Newton’s Third Law • “Whenever one object exerts a force on a second object, the second exerts an equal force in the opposite direction on the first.” • FA on B = -FB on A • Action force- causes the force • Reaction force- reacts to the force in an equal but opposite way to the action force

  4. 6.3 Identifying Action and Reaction • As objects react to each other, action-reaction objects doesn’t really matter. • Action: Object A exerts a force on Object B • Reaction: Object B exerts a force on Object A

  5. 6.4 Action and Reaction on Different Masses • Mass and acceleration are inversely proportional • Force and acceleration are directly proportional • Example: Mallet & Post • Mallet: large mass, small acceleration • Post: small mass, large acceleration • Both have an equal but opposite force on them • Example: Bullet being fired • http://www.youtube.com/watch?v=h3PUXbo3tCo&feature=related • http://www.youtube.com/watch?v=f9tCpLNBwxQ&NR=1 • http://www.youtube.com/watch?v=xSkxQxPThi4&feature=related

  6. 6.5 Do Action and Reaction Forces Cancel? • If they cancelled, nothing would ever move! • We need to consider what is in the “system” • System- the area around the force(s) that we are concerned with • If we only care about a football accelerating, we call the football the system • If we care about how the football and the foot interact, we can include them both in the system

  7. 6.6 Horse-Cart Problem • What is pulling what? • FGW- force of the ground on the wagon (friction) • FWG- force of the wagon on the ground • FHW- force of the horse on the wagon • FWH- force of the wagon on the horse (inertia) • FHG- force of the horse on the ground (applied force) • FGH- force of the ground on the horse (friction)

  8. Assessments Review Questions 1-18 Think & Explain 1-15

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