1. Inertia

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. 1 January 1980. 5 min

How can physics be about movement if nothing wants to move? Ah, but forces in the universe make things move and stop moving. But at heart, the first rule of physics says: ""Things like to keep doing what they're already doing.""

2. Mass

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. 5 min

This program introduces the kilogram as a way to measure the mass of an object, and proves that small things can me more massive than large things.

3. Speed

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. 5 min

Expert ball-handling proves force varies with mass and speed.

4. Acceleration (1)

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. 5 min

Force varies with mass and rate of change of speed. It's much easier to stop a slow-moving cannonball than a rapid tennis ball.

5. Acceleration (2)

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. 5 min

It takes only a few seconds for something to accelerate to a max speed. This is demonstrated with a vintage locomotive.

6. Gravity

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. 5 min

What is gravity? Through the fictional story of Newton's apple, we learn about gravity and shed some light on weight.

7. Weight vs. Mass

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. 5 min

Physics has to be specific in distinguishing weight from mass. This is why physicists measure weight in newtons.

8. Work

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. 5 min

How much work are you doing? Whatever the force you apply is measured in newton meters–or joules, after James P. Joule.

9. Kinetic Energy

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. 5 min

The physics of billiard balls begins the first of two programs on energy itself.

10. Potential Energy

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. 5 min

David and Goliath characters demonstrate how potential energy differs from kinetic energy.