1. Unit 7
History of Motion
7.1

2. Aristotle 367 B.C.

3. Geocentrism Earth is center

4. Free Fall According to Aristotle “heavier people would fall faster than lighter people”

5. Galileo Galilei

6. Heliocentrism Sun is center

7. Free Fall According to Galileo “all people would fall at the same rate regardless of mass”

8. Sir Isaac Newton

9. Chapter 5 – Matter in Motion
Section 1 – Measuring Motion
What Is a Force?

10. Force A force is a push or a pull Forces act on objects
Net force – combination of all forces acting on an object
Newton (N) – the SI unit for force

11. Gravity

12. The gravitational “pull” of the Sun on the planets

13. Archimedes 287 B.C.

14. Archimedes Principle Notice how the crown weighs less in water