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|Extension A: Force Diagrams|
|Extension B: Pushing a Skateboarder|
|Extension C: Connecting Force and Energy Models|
|Extension D: How Does Friction Work?|
|Extension E: Changing Direction|
|Extension A: Newton's Second Law|
|Extension B: More on Balanced Forces|
|Extension C: Balanced and Unbalanced Forces|
|Extension D: More on Vertical Motion||HTML5|
|Extension E: Newton's Third Law and Balanced Forces||HTML5|