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Conceptual physics alive! : volume 3 : momentum, energy, center of gravity, rotation / Paul Hewitt.
"Observe Hewitt teach in a classroom with real students, using engaging demonstrations and artwork." -- Publisher website. DVD includes: 1. Momentum: Newton's 2nd law is rearranged to the form: Impulse = Change in Momentum. A variety of everyday examples, such as bouncing are used to support this impulse-momentum concept. Conservation of momentum is demonstrated with colliding carts on an air track. Segment length: 50 minutes. Energy: Mechanical energy in its potential and kinetic forms is illustrated with demonstrations that include a bouncing dart, a pendulum, and a simple pulley system. The conservation of energy is illuminated using everyday examples and a hand-cranked electric generator. Segment length: 48 minutes. 3. Center of Gravity: The concepts of torque, center of gravity, and center of mass are applied to balancing. Demonstrations include finding the center of gravity of irregularly-shaped objects, a weighted disk that rolls uphill, and a seesaw. Segment length: 33 minutes. 4. Rotation: The concept of rotational inertia is developed from a variety of everyday examples and demonstrations using weighted objects, and rolling cans filled with both liquids and solids. Finally, Paul stands on a rotating turntable to demonstrate angular momentum. Segment length: 46 minutes.