head 1.4; access; symbols; locks; strict; comment @# @; 1.4 date 2017.06.18.01.16.47; author root; state Exp; branches; next 1.3; 1.3 date 2017.06.17.12.47.11; author root; state Exp; branches; next 1.2; 1.2 date 2017.06.16.15.06.46; author root; state Exp; branches; next 1.1; 1.1 date 2017.06.16.15.06.45; author root; state Exp; branches; next ; desc @This document (2.5 Distance and time) is re-created by administrator on 18 April 2017 @ 1.4 log @This document (2.5 Distance and time) is lastly updated by administrator status:PUBLISHED on 18 June 2017 @ text @{ "_id": { "$oid": "5943f4054975ac013d36fae3" }, "_type": "GSystem", "access_policy": "PUBLIC", "altnames": "2.5 Distance and time", "annotations": [], "attribute_set": [], "author_set": [ 1 ], "collection_set": [], "comment_enabled": null, "content": "
Look at the video below to tell whether motion is easy to describe this time?
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Video 2.5: Distance and Time
\r\n\r\n\r\n\r\n\r\nWhy is it easy to describe the motion of objects in these video clips?
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Let us guess the strategy you used to describe this motion.
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You used the static background to describe the motion of the boat. The boat changes its position from one point to another which means it covers some distance.
\r\nYou also intuitively know that it takes time for the boat to move from one point to another.
\r\nTo describe something in motion you need both distance and time.
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look at the Video below to tell which motion was easy to describe?
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\r\n\r\n\r\nWhy was it easy to describe the motion of the boat in second shot?
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You used the static background to describe that motion of the boat. the boat changes its position from one point to another. which means it covers some distance.
\r\nyou also intuitively know that it takes time for the boat to move from one point to another.
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\r\nTo describe something is motion. you need distance and time both.
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