Inertial Frame of Reference Discussion Outline

1
Inertial Frame of Reference Discussion Outline

• Created for CVCA Physics
• By
• Dick Heckathorn
• 28 November 2K 4

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Table of Contents

• 7 Laser Disk A 48
• 8 Laser Disk B 16, 17
• 9 Laser Disk Frames of Reference
• 13 Some Questions
• 19 Laser Disk _ 12, 13, 14
• 22 Laser Disk _ 15, 16, 17, 18, 19
• 23 Student Analysis Air Puck on Turntable
• 24 Power Point Air Puck on Turntable
• 25 Riding the Rotor
• 26 Problem Puck on Turntable
• 27 Laser Disk B 24, 28, 29
• 28 Video Rotor Geauga Lake
• 31 Summary

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• Have you ever, in a car wash
• jammed your foot on the brake when you felt the
  car moving and then felt foolish when it wasnt.

4

• Have you ever, while stopped at a stoplight
• jammed your foot on the brake when you felt the
  car moving and then felt foolish when it wasnt.

5

• Have you ever
• thrown a ball up while riding in a car or bus and
  wondered how it looked from outside the car or
  bus?

6

• Have you ever...
• ?

7

• Have you ever...
• wished to be in a space shuttle approaching a
  space craft?

8
Cinema Classics Disk

• Side A Chapter 48
• Ball being dropped
• from mast of ship

9
Cinema Classics Disk

• Side B Chapter 16
• Airplane and Flare
• Side B Chapter 17
• Snowmobile and Flare

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Laser Disk

• Frame of Reference

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Laser Disk Frames of Reference

• 1. Introduction
• 2. Who is right side up?
• 3. Moving cart or wall?
• 4. Earth as reference frame
• 5. Free Fall, constant velocity
• 6. Free Fall, fixed reference frame
• 7. Free Fall, moving reference frame
• 8. Free Fall, w/o a reference frame

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Laser Disk Frames of Reference

• 9. Spot rotating, moving reference frame
• 10. Compare v, different reference frames
• 11. Formulas for v, different reference frames

13

• Is there an absolute frame of reference?
• What do you think?

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• Newtons Law of motion holds equally well whether
  reference frame is not moving at all.
• or moving with constant velocity
• These reference frames are called inertial
  reference frames.

15

• Newtons laws work in an inertial frame of
  reference.
• They do not work in a non-inertial (accelerated)
  frame of reference.

16

• When are you in an inertial frame of reference?
• If you are not moving or moving with a constant
  velocity.

17

• Have you ever...
• seen books sliding across the car seat or the
  dash as you turned a corner?

18

• What is the force(s) acting on the books?
• There are none.
• Why not?
• We are using Newtons laws in a non-inertial
  (accelerated) frame.

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Laser Disk Frames of Reference

• 12. Free Fall, accelerated cart
• 13. Free Fall, slow motion accelerated cart
• 14. Inertial Reference Frame and Fictitious Force

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• If the reference frame is accelerating
• Newtons laws of motion do not work.

21

• If you placed a helium filled balloon in a car or
  bus, what would it do when
• you accelerated from rest?
• you accelerated to a stop?
• you turned a corner?

22
Laser Disk Frames of Reference

• 15. Puck, Rotating Reference Frame
• 16. Puck, Fixed Reference Frame
• 17. Puck, Fcp and Fcf
• 18. Puck, Fictitious Force Frame
• 19. Earth and Fictitious Forces

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Transparency

• Student Investigation
• A Paper Model
• Ball on Turntable

24
Power Point

• Air Puck on Rotating Platform

25
Demonstration

• Riding the Rotor

26
Power Point

• Frame of Reference Problem

27
Cinema Classics Disk

• Circular Motion
• Side B Chapter 24
• Ball and Merry-Go-Round
• Side B Chapter 28
• Rotor Ride
• Side B Chapter 29
• Dry Ice Puck on Turntable

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Geauga Lake Video

• The Rotor

29

• Discuss
• Force(s) on ball rotating in a circle
• What is the outward (centriFugal) force on the
  ball?

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• There is none.
• Why not?
• We are using Newtons laws in a non-inertial
  (accelerated) frame of reference where they dont
  work.

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Summary

• Newtons laws apply in inertial reference frames,
  but they do not apply in accelerated reference
  frames.

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• Is the earth accelerating?
• If so then why do Newtons laws work?
• The expected differences are too small to
  observe.

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• 1905 Einstein
• a bodies mass will increase as the velocity of
  the body increases which is noticeable only when
  the body approaches the speed f light

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• w. ecp (207) 60 analyze pendulum hung from roof
  of car

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Laser Disk Frames of Reference

• Foucault Pendulum
• 20. Earth and Foucault Pendulum
• 21. Summary

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Thats all folks!