Chapter 4: Forces and the Laws of Motion Page 123 and following

4-1: Changes in Motion 1) What is a Force? – What are the three characteristics of Forces? – Give two examples of contact forces. – Give two examples of field forces. 2) What is a “Force Diagram”? – What is a “Free-Body Diagram”?

4-2: Newton’s First Law 1) State Newton’s First Law. – What is inertia? – What is a “net external force”? – How does a net external force effect motion? 2) How does the concept of “equilibrium” relate to Newton’s First Law?

4-3: Newton’s Second and Third Laws 1) State Newton’s Second Law, (words and equation) – Give an example of Newton’s 2 nd Law. 2) State Newton’s Third Law – What is an “action-reaction pair” – Give an example

4-4: Everyday Forces 1) Define weight – What two properties is weight a function of? 2) What is a “normal force” – Sketch an illustration 3) Define Friction. – What are five characteristics of the Force of Friction? – Contrast “static” and “kinetic” friction – Sketch a force diagram that has friction in it.