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Today’s special

In today's session, we explored Newton's Third Law of Motion, focusing on cause and effect within motion. We discussed key principles such as inertia, the relationship of force, mass, and acceleration, and the dynamics of action and reaction forces. Engaging examples were analyzed, including rocket launches and tug-of-war scenarios. For homework, please review chapters and complete designated exercises. Remember to apply safety procedures in lab investigations and prepare for the upcoming test.

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Today’s special

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  1. Today’s special • Hw check – vocab • Test results • Notes • HW for next time: • HW I due

  2. Newton’s Third Law of Motion PAe.7: Explain the motion of objects on the basis of Newton’s three laws of motion: inertia; the relationship among force, mass, and acceleration; and action and reaction forces. PAa.1: Generate hypotheses on the basis of credible, accurate, and relevant sources of scientific information. PAa.2: Use appropriate laboratory apparatuses, technology, and techniques safely and accurately when conducting a scientific investigation. PAa.9: Use appropriate safety procedures when conducting investigations.

  3. Question • When a rocket blasts off, if it was not near the ground, would it take off?

  4. Newton’s Third Law • Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first

  5. Simple rule • Action: Object A exerts force on object B • Reaction: Object B exerts a force on object A

  6. Action and reaction • Effects on objects differ if their masses are different • a = F/m • Decreasing mass makes the acceleration greater

  7. Action and reaction forces act on different objects • Forces cancel only when they act on the same body

  8. Donkey cart • Equal and opposite? • Donkey pulls and cart and pushes on road

  9. Bull fights • Why are they dangerous?

  10. Tug-of-war • How does it work?

  11. Question • When a rocket blasts off, if it was not near the ground, would it take off?

  12. Homework • Chapter Review HW: pp. 80-82 • I. Review questions2-20 even (due date: ____________) • II. Exercises 2-20 even; Problems 1-8 (due date: __________)

  13. Today’s special • HW check; Q & A • Lab • Newton’s Laws video • Lab due next time! Don’t forget to write your conclusion

  14. Today’s special • Turn in lab on front table • Some equations for HW II • Work on HW II with table partner (work on problems, first!) • Handout: Newton’s 3rd Law • New seating chart

  15. Some equations for HW II • F=ma • a=v/t • F1=-F2

  16. Example • Billy rides his bike from rest to 8 m/s in 4 s. How much force did Billy apply to his bike if he and his bike have a mass of 75 kg?

  17. Example • Sally pushes her skateboard with a force of 5 N. The skateboard has a mass of 2 kg. How fast is it going after 3 seconds?

  18. Today’s special • Student Agenda grade (planner) • HW II check • Computer project • Practice Test on Smartresponse system; enter answers, make corrections before turning in next class • Test 4 next time!

  19. Today’s special • Turn in Practice test on front table • Test 4 Newton’s 3rd Law, enter MC answer on smart response • Turn in test completed with sentences & essays • Get Vocab 5: Momentum; work quietly until everyone has finished their test. • Movie time!

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