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For a chat, sharing is clear -- one shares the text typed in by the different users.
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Now start and share in the same way, one or more of the simple physics applets -- spring or cross-product.
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The teacher (deemed the master if he or she started it) can move the Position of the spring and the Force and Energy change in response.
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All applets in the same session follow the behavior of the master
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Maybe your spring does not follow? Did you join this session or another one? Perhaps you started a new session by clicking on spring icon rather than by highlighting spring session and clicking on join!
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Note that "slaves" cannot move spring position -- they are meant to gaze in wonder and growing understanding as teacher moves spring and uses video conferencing to wax eloquent about the physical principles
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In spring case, Tango shares state defining applet -- here the position of the Spring.
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