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Exploring Newton's Laws: Forces, Equilibrium, and Homework Assignments

In this lecture, we delve deeper into Newton’s Laws of motion, focusing on force interactions and equilibrium. We examine practical applications through problems and examples, such as the forces acting on an elevator and a child on a slide. Students will explore topics including frictional forces, static versus kinetic friction, and tension in ropes and pulleys. Homework assignments include problem sets on interacting objects and understanding dynamics in various scenarios. Prepare for an engaging discussion and application of physics principles!

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Exploring Newton's Laws: Forces, Equilibrium, and Homework Assignments

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  1. Lecture 15 Wednesday, October 1 More Newton’s Laws

  2. Estimated number of Juveniles the US has detained as enemy combatants since 2002 • 2,500

  3. Quiz • An elevator, lifted by a cable, is going up at a steady speed. • Identify the forces acting on the elevator. Make a free body diagram. • Is T greater than, equal to, or less than w? Or is there not enough information to tell? Slide 4-23

  4. Homework questions?

  5. Monday Review • Equilibrium FNET = 0 • Frictional forces

  6. Today • Sections 5:6-8 • 5.6 Drag, read but I will not hold you responsible. Skip problems 5:30, 31 • 5.7 Interacting objects– applications of Newton’s Third Law • 5.8 Ropes and Pulleys—tension—work example like last week’s lab

  7. Review Example Macie pulls a 40 kg rolling trunk by a strap angled at 30° from the horizontal. She pulls with a force of 40 N, and there is a 30 N rolling friction force acting on trunk. What is the trunk’s acceleration? Slide 5-17

  8. The coefficient of static friction is • 1. smaller than the coefficient of kinetic friction. • 2. equal to the coefficient of kinetic friction. • 3. larger than the coefficient of kinetic friction. • 4. not discussed in this chapter.

  9. Problem • 5:24 A 23kg child on slide inclined at 380. • What forces act on child? • Make a free body diagram • Magnitude of normal force? • If the coefficient of static friction is 0.62, will the child start to slide?

  10. Problem, interacting bodies Glider on a air track Massless, frictionless pulley m1 m2

  11. Problem MC26Dog in an elevator

  12. Problem MC30Two blocks on an inclined plane

  13. Problems due Friday • 5:24, 25, 29, 30, 31, 35, 36, 37, 39 • Special assignment to be handed in Friday: Workbook pages 4-5 and 4-6, exercises 17-22 and page 5-5, exercises 13-15.

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