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4.1 Conservation of momentum
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4.2 Center of mass
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4.3 Instantaneous version of Newton's 2nd Law
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4.4 Statics: dp/dt = 0
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4.5 Example: pushing a box, with friction
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4.6 Judging the direction of dp/dt
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4.7 Curving motion: parallel and perpendicular components of dp/dt
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4.8 Components from the vector dot product
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4.9 Example: a falling ball
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4.10 Rate of change of direction
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4.11 Example: kissing circle for falling ball
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4.12 Example: swinging a bucket