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 2nd 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.