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.
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)
Lectures and Notes:
Syllabus (Conceptual Physics)
Notes Chapter 6 (Newton’s Second Law)
PowerPoint Lecture Chapter 6
Notes Chapter 7 (Newton’s Third Law)
PowerPoint Lecture Chapter 7
Practice Quiz:
Chapter 8 Student Notes (Momentum)
Chapter 8 PowerPoint Lecture Chapter 8
Practice Test: Chapters 1-7
Practice Quiz: Chapter 8
Worksheet: Fall Final Review
Grading Rubric: Fall Final Review
Kahoot Fall Final Review
Worksheets:
Worksheet: Defining Terms Chapter 6
Worksheet: Concept Review Chapter 6
Worksheet: Equation Review Chapter 6
Worksheet: Newton’s Second Law
Practice Quiz: Newton’s Second Law
Practice Quiz: Chapter 6
Worksheet: Defining Terms Chapter 7
Worksheet: Concept Review Chapter 7
Worksheet: Equation Review Chapter 7
Worksheet: Chapter 1-7 Review
Grading Rubric: Worksheet-Chapter 1-7 ReviewConcept Review Chapter 8
Equation Review: Chapter 8
Momentum Word Problems
Equation Review: Chapter 8 Conservation of Momentum Worksheet: Momentum Test Review
Labs and Classroom Activities:
Lab: Balloon Rockets
Lab: Motion and Forces (PHet)
Lab: Lunar Lander (PHeT)
Lab: Newton’s Third Law (PHet)
Lab: Conservation of Momentum (Collisions)
Lab: Conservation of Momentum (pHet)
Textbook Resources:
Conceptual Physics Paul Hewitt
Hewitt Drew-it
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Videos:
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 (video worksheet)