[問題] 鉛直SHM
質量1KG的球自彈簧頂端1M高落下 K=100N/m
最大壓縮量=?
最大速率=?
1 mg(1+x)=1/2*k*x^2
10(1+x)=50x^2
這步驟本上可以接受
當作重力位能轉為彈力位能
x=0.56 m
2 平衡點v最大 此時壓縮量=mg/k=0.1m
此時小球之動能 1/2mv^2=mgh-1/2kx^2=1*10*1.1-1/2*100*0.1^2
v=4.6 m/s
這點看不懂
我是用力學能守恆 答案一樣 不知是否碰巧
想法
振幅=0.56-0.1=0.46m
1/2*100*0.46^2=1/2*1*v^2
v=4.6 m/s
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