國中自然3上_3-2
Quiz
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Fun
•
7th - 9th Grade
•
Practice Problem
•
Hard
Tang Da
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10 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
如附圖所示,在光滑平面上有一質量為5公斤的靜止物體,受20牛頓的作用力沿水平方向推動。當作用力推動物體3秒後即不再作用於物體上,則再經3秒後,物體的動能將有何改變?
比第3秒時增加360焦耳
維持第3秒時所具有的動能
比第3秒時減少360焦耳
變成0
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
射箭選手以手拉弓射箭,設箭的質量為100公克,選手施力200牛頓拉滿弓,箭離弦之前總共移動10公分,若箭受到弓的力量為均勻的,且不計摩擦阻力,則箭射出瞬間的動能為多少焦耳?
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
如附圖所示,小勝將靜止的球由A點沿著軌道向B點滑下,若不考慮空氣阻力、球與軌道間摩擦力,則下列敘述何者正確?
小球不可能到達E點
小球可能到達G點
小球在E點的位能最大
小球在A點的位能最大
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
如附圖所示,將甲~丙三顆密度相同、體積不同的鐵球由相同高度落下,何者能將鐵釘打入最深?
甲
乙
丙
一樣深
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
關於功與能的敘述,下列何者錯誤?
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
在地面上a點將石頭以10 m/s的速度斜向拋出,其軌跡如附圖,若不計空氣阻力,下列各項敘述何者錯誤?
石頭到達最高點b,其動能最大
石頭由a→b的過程位能增加
石頭到達c點速率仍為10 m/s
石頭到達d點時,速率最快
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
電能轉換成光能和熱能可用來照明,在整個過程中,下列哪一項定律是成立的?
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