The document explores the principles of motion, comparing Aristotle's and Galileo's views on vertical, horizontal, and projectile motion. It explains Galileo's inference that objects in a vacuum fall with uniform acceleration and that force is not needed for horizontal motion. The focus is on the essential learning competency of understanding these differing conceptions.

1. Investigating Principles Governing Motion
Prepared by:
Mary Carmel J. Gaga-a

2. Most Essential Learning
Competency
•Compare and Contrast the Aristotelian and
Galilean conception of vertical motion,
horizontal motion, and projectile motion
•Explain how Galileo inferred that objects in a
vacuum fall with uniform acceleration, and
that force is not necessary to sustain
horizontal motion.