Now you know how to use position, distance and displacement to describe where something moves, but what about how fast? How can you describe the difference between how fast you ride a bike and how fast a racecar zooms around a track? Or how slow an ant crawls across the sidewalk and a cat stalks a bird?
Watch this animation to find out more about using speed to explain how fast or slow something moves as well as where direction fits in. As you watch the segment, you might want to check the definitions of specific terms. In addition to the glossary words listed above, the terms constant, speed and velocity will be described.
Stop the animation at any time, watch it again, or read the transcript.
Keyboard Shortcut | Action |
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Space | Pause/Play video playback |
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Up and Down arrows | Increase and decrease volume by 10% |
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f | Enter or exit fullscreen. (Note: To exit fullscreen in flash press the Esc key. |
c | Press c to toggle captions on or off |
In the space below write a definition of speed. Then describe how velocity is similar to speed and how it is different. Finally, describe how you can tell from its speed how quickly an object is moving. i