1. Lecturer: Lu Wanpeng July 14th
Two New Sciences
Discourses and Mathematical Demonstrations Relating to Two New Sciences
Lecturer: Lu Wanpeng
July 14th

2. Introduction 1638 Galileo’s final book
Covering much of his work in physics over the preceding thirty years
 Laid the foundations of modern physics

3. Two new sciences The strength of materials : square-cube law
"...ratio of two volumes is greater than the ratio of
their surfaces."
The motion of objects
Constant acceleration of a falling body
Measure accurately using an inclined plane

4. Three man - different stages of life
Three men and four days
Three man - different stages of life
three men (Simplicio, Sagredo, and Salviati)
Four days - different areas of physics
First Day : an introduction
Second day : the strength of materials
Third day : uniform and naturally accelerated
motion
Fourth day : projectile motion

5. Reactions by commentators
“So great a contribution to physics was Two New Sciences that scholars have long maintained that the book anticipated Isaac Newton’s laws of motion.”
— Stephen Hawking.
“Galileo ... is the father of modern physics—indeed of modern science“
—Albert Einstein.

6. Thank you for listening