Anonymous
Anonymous asked in 科學其他:科學 · 2 decades ago

兩個普物問題(用中文回答)

1 Describe a situation in which the net external force on a system is not zero yet its speed remain constant.

2 A system can have a nonzero velocity while the net external force on it is zero. Describe such a situation.

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  • 2 decades ago
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    1.題目是要你舉例一個外力合不為零,但是系統的速率為一定值的情況

    最明顯的就是圓周運動拉,圓周運動的合力恆指向圓心,但是速度卻保持不變,不過速度就有變化了,因為方向一直在改變

    2. 反過來問,什麼情況外力為零,速率不為零,這提更簡單了,那就是等速度運動阿,在外太空沒有受到任何行星吸引的隕石,在光滑平面上等速滑行的物體

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