1. Inertial Frame of Reference Discussion Outline
Created for CVCA Physics By
Dick Heckathorn
28 November 2K + 4

2. 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

3. 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 wasn’t.

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 wasn’t.

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
Snowmobile and Flare

10. Laser Disk
Frame of Reference

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

12. Newton’s 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.

13. Newton’s laws work in an inertial frame of reference.
They do not work in a non-inertial (accelerated) frame of reference.

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

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

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

17. If the reference frame is accelerating…
Newton’s laws of motion do not work.

18. 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?

19. Student Investigation
Transparency
Student Investigation
A Paper Model
Ball on Turntable

20. Air Puck on Rotating Platform
Power Point
Air Puck on Rotating Platform

21. Demonstration
Riding the Rotor

22. Frame of Reference Problem
Power Point
Frame of Reference Problem

23. Ball and Merry-Go-Round Dry Ice Puck on Turntable
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

24. Geauga Lake Video
The Rotor

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

26. There is none.
Why not?
We are using Newton’s laws in a non-inertial (accelerated) frame of reference where they don’t work.

27. Summary:
Newton’s laws apply in inertial reference frames, but they do not apply in accelerated reference frames.

28. Is the earth accelerating?
If so then why do Newton’s laws work?
The expected differences are too small to observe.

29. 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

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

31. Laser Disk Frames of Reference
Foucault Pendulum
20. Earth and Foucault Pendulum
21. Summary

32. That’s all folks!