Conceptual Physics Alive: Energy includes a digital video and questions set with answers.

Observe Paul Hewitt teach in a classroom with real students, using engaging demonstrations and artwork. In this video, Paul Hewitt teaches 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.

Energy Includes:

• Begins with a review of momentum, and poses questions that support the concept of impulse.
• Hewitt demonstrates momentum transfer by a swinging dart that hits a wooden block. The greater impulse of bouncing is demonstrated.
• "How long" in terms of distance, rather than time, produces work.
• Work-energy relationship introduced; Fd = energy.
• Forms of energy are compared.
• Energy of motion; kinetic energy (KE).
• Cannonball shot from a short and a longer cannon.
• Demonstration of a bowling ball pendulum pulled with a spring scale to show the force variation with angle.
• Demonstration of energy transfer from potential to kinetic with the bowling ball pendulum.
• Conservation of energy.
• Chalkboard sketches of conservation of energy
• Demonstration of the work done in raising a mass with different forces.
• Machines.
• Carjack.
• Raising a piano with pulleys.
• Energy to drive an automobile.
• Efficiency.
• Demonstration of turning a generator to light a lamp. Paul is assisted by Meidor, a regular visitor.
• Gasoline mileage and applying a cigarette tighter in a car, and driving with lights on.
• Skidding distance for a car.
• Superball demonstration for humor.

Next-Time Question: A section of a racquetball is inverted (giving it elastic potential energy) and dropped. It bounces higher from the table than its initial position. Why? (SEE RESOURCES TAB FOR MORE)

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