[解題] 國三 槓桿原理
1.年級:國三
2.科目:理化
3.章節:槓桿原理
4.題目:不會畫圖...口訴說明 ~"~
一塊長木板,右邊壓著物體a,左邊壓著物體b,中間靠近b有一支點
木板為傾斜靜止狀態!(b端底地,a端離地)
請問木板共受到幾個力? 答案是四個
5.想法:我只找的到三個! 一個是a壓木板的力.一個是b壓木板的力
第三個是支點撐住木板的力...第四個不知道是誰...
是合力矩嗎? 可是靜止不動,合力矩是0不是嗎? 謝謝解答
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