Newton’s First Law states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force. It may be seen as a statement about inertia, that objects will remain in their state of motion unless a force acts to change the motion. Any change in motion involves an acceleration, and then Newton’s Second Law applies; in fact, the First Law is just a special case of the Second Law for which the net external force is zero.

Newton’s First Law contains implications about the fundamental symmetry of the universe in that a state of motion in a straight line must be just as “natural” as being at rest. If an object is at rest in one frame of reference, it will appear to be moving in a straight line to an observer in a reference frame which is moving by the object. There is no way to say which reference frame is “special”, so all constant velocity reference frames must be equivalent.action reaction

Newton’s third law: All forces in the universe occur in equal but oppositely directed pairs. There are no isolated forces; for every external force that acts on an object there is a force of equal magnitude but opposite direction which acts back on the object which exerted that external force. (http://hyperphysics.phy-astr.gsu.edu/hbase/Newt.html)

  website resources

Lectures and Notes:

Syllabus (Conceptual Physics)
Chapter 6 Student Notes (Newton’s Second Law)
Chapter 7 Student Notes (Newton’s Third Law)
Chapter 8Student Notes (Momentum)
Chapter 6 PowerPoint Lecture (Newton’s Second Law)
Chapter 7 PowerPoint Lecture (Newton’s Third Law)
Chapter 8 PowerPoint Lecture (Momentum)


Labs and Classroom Activities:

Lab: Balloon Rockets
Lab: Exploring Potential and Kinetic Energy (simulation)

Textbook Resources:


Bozeman:  Forces and Motion (video worksheet)
National Geographic | Gravity – Documentary HD
TedEd: Football physics: The “impossible” free kick 
Newton’s Laws: Crash Course
TedEd: Newton’s 3 Laws, with a bicycle