Keyboard Shortcut | Action |
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Space | Pause/Play video playback |
Enter | Pause/Play video playback |
m | Mute/Unmute video volume |
Up and Down arrows | Increase and decrease volume by 10% |
Right and Left arrows | Seek forward or backward by 5 seconds |
0-9 | Fast seek to x% of the video. |
f | Enter or exit fullscreen. (Note: To exit fullscreen in flash press the Esc key. |
c | Press c to toggle captions on or off |
1.
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First, determine how many pieces of paper the magnet can hold against a refrigerator. Record the number of papers each can hold before the magnet or papers fall.
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2.
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Next, place the magnets in the refrigerator for 30 minutes. Take the magnets out. Record the number of papers they can hold.
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3.
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Finally, place the magnets outside on a warm sunny day for 30 minutes. (If it is not hot outside, place the magnet under a lamp or light.) Record the number of papers they can hold.
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What happened to the magnetic forces when the temperature of the magnets changed?
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