In FREE SPACE - that is, where there is no opposition to motion - as in a vacuum -ALL BODIES near the Earth fall with the same acceleration. This is a consequence of Newton's Second Law explored in Program *3 where we learned that F = ma and W = mg. In FREE FALL a body starting at rest falls 16' in the first second; 48' in the second second; 80' in the third second. These distances are in the ratio of 1:3:5. The total distance fallen is 16' in the first second; 64' in the first two seconds; 144' in the first three seconds. These distances are in the ratio of 1:4:9 which is to say - in the ratio of n:2^:3 . These interesting things were first arrived at by Galileo. When a body has motions both vertical and horizon¬tal simultaneously these motions take place independent of each other.

A - We show the Classical Guinea and Feather Tube. With the tube highly evacuated - much of the air taken out - the light feather and the heavy coin would fall side by side.

B - We show a record of a freely-falling body - electrically recorded every 1/60 of a second. The dots on the tape show the facts enumerated above but on a smaller scale.

C - When a body A is allowed to fall vertically and another B is projected horizontally a wonderful thing is observed: Both hit the ground at the same time! The path of B is a parabola.

D - When a body is projected vertically upward from a car moving horizontally another enchanting thing is observed: The car catches the ball later on in its path. At the instant the ball is projected up it has two motions: a vertical one which is acted on by gravity as a freely falling body and a horizontal motion which remains unaltered.

E - THE MONKEY AND HUNTER DEMONSTRATION is filled with Drama. With the gun bore-sighted on the Monkey the Monkey drops from his place high up at the instant the projectile emerges from the muzzle. The Monkey is hit!

F - If an array of bodies - say billiard balls - is fixed to a string in a manner following the numbers of Galileo - that is in a ratio like 1:4:9 and the string is allowed to fall vertically - the impact of the balls on the floor below occurs in equal time intervals.

We show a photograph - a likeness - of Galileo whose DIALOGUES should be read by every student. In these we find Sagredo and Salviati and Simplicio engaged in heated but friendly discussion of many of the Events of Nature -especially those we are concerned with here.

1. The Idea of the Center of Gravity
2. Newton's First Law of Motion: Inertia
3. Newton's Second Law of Motion: The Elevator Problem
4. Newton's Third Law of Motion: Momentum
5. Energy and Momentum
6. Concerning Falling Bodies & Projectiles
7. The Simple Pendulum and Other Oscillating Things
8. Adventures with Bernoulli: Bernoulli's Principle
9. Soap Bubbles and Soap Films
10. Atmospheric Pressure
11. Centrifugal Force and Other Strange Matters
12. The Strange Behavior of Rolling Things
13. Archimedes' Principle
14. Pascal's Principle: The Properties of Liquids
15. Levers, Inclines Planes, Geared-wheels and Other Machines
16. The Ideas of Heat and Temperature
17. Thermometric Properties and Processes
18. How to Produce Heat Energy
19. Thermal Expansion of Stuff: Solids
20. Thermal Expansion of Stuff: Gases & Liquids
21. The Strange Thermal Behavior of Ice and Water
22. Heat Energy Transfer by Conduction
23. Heat Energy Transfer by Convection
24. Heat Energy Transfer by Radiation
25. Evaporation, Boiling, Freezing: A Dramatic Adventure
26. Miscellaneous Adventures in Heat
27. The Drama in Real Cold Stuff: Liquid Nitrogen
28. The Physics of Toys: Mechanical
29. The Physics of Toys: Acoustic and Thermal
30. Waves: Kinds of Properties
31. Sound Waves: Sources of Sound & Pitch and Frequency
32. Vibrating Bars and Strings: The Phenomenon of Beats
33. Resonance: Forced Vibrations
34. Sounding Pipes
35. Vibrating Rods and Plates
36. Miscellaneous Adventures in Sound
37. Electrostatic Phenomena: Foundations of Electricity
38. Electrostatic Toys, Part 1
39. Electrostatic Toys, Part 2
40. Adventures with Electric Charges
41. Adventures in Magnetism
42. Ways to "Produce" Electricity
43. Properties and Effects of Electric Currents
44. Adventures in Electromagnetism
45. Further Adventures in Electromagnetism
46. Miscellaneous and Wondrous Things in E&M

Demonstrations in Physics was an educational science series produced in Australia by ABC Television in 1969. The series was hosted by American scientist Julius Sumner Miller, who demonstrated experiments involving various disciplines in the world of physics. The series was also released in the United States under the title Science Demonstrations.

This program was a series of 45 shows (approximately 15 minutes each) on various topics in physics, organized into 3 units: Mechanics; Heat and Temperature / Toys; and Waves and Sound / Electricity and Magnetism.