Khan Academy on a Stick : Work and energy

Khan Academy on a Stick

Physics

Introduction to work and energy
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Introduction to work and energy
Work and Energy (part 2)
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More on work. Introduction to Kinetic and Potential Energies.
Conservation of Energy
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Using the law of conservation of energy to see how potential energy is converted into kinetic energy
Work/Energy problem with Friction
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A conservation of energy problem where all of the energy is not conserved.

Work and energy

You're doing a lot more work than you realize (most of which goes unpaid). This tutorial will have you seeing the world in terms of potentials and energy and work (which is more fun than you can possibly imagine).

Introduction to mechanical advantage
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Introduction to simple machines, mechanical advantage and moments.
Mechanical Advantage (part 2)
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More on mechanical advantage, levers and moments.
Mechanical Advantage (part 3)
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Introduction to pulleys and wedges

Mechanical advantage

If you have every used a tool of any kind (including the bones in your body), you have employed mechanical advantage. Whether you used an incline plane to drag something off of a pick-up truck or the back of a hammer to remove a nail, the world of mechanical advantage surrounds us.

Intro to springs and Hooke's Law
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Introduction to Hooke's Law
Potential energy stored in a spring
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Work needed to compress a spring is the same thing as the potential energy stored in the compressed spring.
Spring potential energy example (mistake in math)
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A spring, a frozen loop-d-loop and more! (See if you can find the mistake I made and get the right answer!)

Springs and Hooke's Law

Weighing machines of all sorts employ springs that take a certain amount of force to keep compressed or stretched to a certain point. Hooke's law will give us all the tools to weigh in on the subject ourselves and spring into action (yes, the puns are annoying us too)!