
國中自然3上ch3-4簡單機械
Authored by 翰林出版國中自然 翰林出版國中自然
Physics
9th Grade
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8 questions
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1.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
有關螺旋的敘述,下列何者錯誤?
它是斜面的一種應用
是一種省力的裝置
螺紋愈密,使用時愈費力
需旋轉的瓶蓋是螺旋的運用
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
如圖,將光滑斜面上的物體等速提升時,施力 F1、 F2大小關係為何?
無法判斷
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
如圖所示,沿一光滑斜面施力 F,將物體由斜面底端等速度拉到頂端,下列敘述何者正確?
物體上升過程中,因為速度不變,所以位能保持不變
施力 F 的大小等於物體的重量
斜面高度固定,若斜面長度愈大,則施力 F 愈大
斜面長度固定時,斜面高度愈大,施力 F 愈大
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
如圖,若兩種裝置之力對物體皆作功 800 焦耳後,則物體等速上升的高度關係為何?(動滑輪重及摩擦力不計)
甲>乙
甲=乙
甲<乙
無法判斷
5.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
如圖為一輪軸,其輪與軸半徑比為 4:1,若無摩擦力,則施力大小 F 最小應為多少方能將物提升上去?
5 kgw
10 kgw
40 kgw
80 kgw
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
關於各種機械裝置的敘述,下列何者正確?
支點在中間的槓桿一定較省力
抗力點在中間的槓桿一定較費力
使用動滑輪較省力但費時
分別用 4 公尺與 6 公尺長的斜面,將物體推高 2 公尺,兩者所需的力相等
7.
MULTIPLE CHOICE QUESTION
20 sec • 5 pts
阿群到五金行想買一把螺絲起子及螺絲,請建議他買哪一種組合方式,如附圖,使用起來比較省力?
(甲)、(丙)
(甲)、(丁)
(乙)、(丙)
(乙)、(丁)
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