OpenStax
Open Stax: Newton's Second Law of Motion: Concept of a System
In the following interactive students will begin to define net force, external force, and system and understand Newton's second law of motion. They will also apply Newton's second law to determine the weight of an object.
OpenStax
Open Stax: Development of Force Concept
In the following interactive students will begin to understand the definition of force.
Khan Academy
Khan Academy: What Is Newton's First Law?
Newton's First Law also called the law of inertia is the most important thing to realize about motion. This article offers more information on motion and explains solved problems involving Newton's First Law. Also included is a video...