Hewitt-Drew-it! 79. Energy of Phase Changes

The roles of heat of fusion, and vaporization, in changes in phase.

All of the energy in the universe is... - George Zaidan and Charles Morton

The energy in the universe never increases or decreases -- but it does move around a lot. Energy can be potential (like a stretched-out rubber band waiting to snap) or kinetic (like the molecules that vibrate within any substance). And though we can't exactly see it, every time we cook dinner or shiver on a cold night, we know it's there. George Zaidan and Charles Morton get excited about energy.

 Lesson by George Zaidan and Charles Morton, animation by Pew36 Animation Studios.

 

Interrupted Pendulum

A pendulum swings from a support post and another post is added to interrupt its swing. We desire to know the maximum height at which the pendulum will perform a full loop around the post. The pendulum requires both potential and kinetic energy in order to complete a full loop. Therefore, it will never be able to return to its height of release while completing a full loop. Ultimately, the pendulum has enough energy to complete a full loop when interrupted at a height equal to two-fifths its initial height of release.

 

E=mc² is wrong? - Sixty Symbols

It's the most famous science equation in history... but E=mc² is not technically correct.

Bullet Block Experiment

A bullet is fired upward into a wooden block.  Does the block raise higher if the bullet hits its center of mass, or if the bullets hits elsewhere?

Experiment, prediction, results:


Explanation:

Hewitt-Drew-it! 50.Circular/Elliptical Orbit

Paul distinguishes circular and elliptical orbits with force vectors for each.

 

Hewitt-Drew-it! 36. Energy of Acrobats

A problem solution, nicely simplified, to acrobats Ari, Bari, and their dog Bo.

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Hewitt-Drew-it! 33. Machines and Energy

Paul shows how a simple lever lifts a load, and how Nellie Newton lifts loads with a pulley systems.

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Hewitt-Drew-it! 32. Ballistic Pendulum

Paul explains how the classic ballistic-pendulum problem cannot be solved with energy conservation alone.

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Hewitt-Drew-it! 31. Conservation of Energy

Paul extends the block of ice on a ramp to a bead sliding down a wire, to the motion of acrobats Ari, Bari, and their dog Bo.

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Hewitt-Drew-it! 30. Work-Energy Theorem

Paul enlists Nellie Newton to illustrate the work-energy theorem to solve a motion problem.

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Hewitt-Drew-it! 29. Potential and Kinetic Energy

Paul derives kinetic energy from Newton's second law, and illustrates energy transfers for a block of sliding ice.

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Hewitt-Drew-it! 28. Work and Potential Energy

Paul illustrates work and potential energy via a barbell and other vertical lifts, and the energy states of a simple pendulum.

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Work - Sixty Symbols

A rubber band and hair dryer are used to explain the concept of work.

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Einstein's Proof of E=mc²

Ever wonder how Einstein proved E=mc²? This is how.

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Energy Efficient Light Bulb Comparison

A comparison of energy efficient compact fluorescent and LED light bulbs with a standard incandescent bulb. Produced by AlternativeE.org.

 

Energy - Sixty Symbols

It's one of the most important concepts in physics - but defining energy is not the easiest task.

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Eureka! Episode 28 - Heat as Energy

Heat is produced whenever there is movement and friction between two objects. Since movement is a form of energy, it follows that heat must also be a form of energy.

Other Eureka episodes

MIT 8.01 Classical Mechanics Lecture 18

MIT Physics Course

Professor Walter Lewin

8.01 Physics  I: Classical Mechanics, Fall 1999

Exam review: mostly work energy theorem and conservation of energy.

See other videos in this series.

IBPH Episode #8 - Simple Harmonic Motion (Part 2)

This is the second video on "Simple Harmonic Motion" (SHM)
Topics covered in this episode: (a) The period of a gravitational pendulum (b) Using a gravitational pendulum to determine the acceleration due to gravity, g, (c) Measuring mass using harmonic oscillators, (d) Energy in SHM, (e) Connection between SHM and uniform circular motion.

Source:  Horatiu Pop

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