**Herong's Notes on Physics** - Version 3.21, by Dr. Herong Yang

Newton's Laws of Motion

This chapter provides an introduction of Newton's Laws of Motion. Topics include Newton's First, Second and Third Laws of Motion; dependency on frame of reference; the gravitational force; the fictitious force.

Falling Ball in Earth Frame of Reference

Conclusion:

- Newton's First Law of Motion (Law of Inertia) - No force, no acceleration.
- Newton's Second Law of Motion - Force equals to mass times acceleration.
- Newton's Third Law of Motion - Force appears in pairs of opposite directions.
- Earth exerts a gravitational force (9.8 newton/kg) on all objects at sea level.
- Accelerating frame of reference exerts a fictitious force on objects in opposite direction.

Table of Contents

Introducion of Frame of Reference

Introduction of Special Relativity

Time Dilation in Special Relativity

Length Contraction in Special Relativity

The Relativity of Simultaneity