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thieuquoc0111
1 năm trước
Treo mọt vật nặng vào lò xo xoắn. Hỏi: a.Vật tác dụng vào lò xo một lực kéo hay lực đẩy? b. Kết quả tác dụng lực của vật lên lò xo làm lò xo sẽ như thế nào? c. Lò xo có tác dụng lực lên vật không? Lực đó là lực gì? d. Tại sao khi treo vật vào lò xo, vật không bị rơi xuống đất? Khi đó có cặp lực nào cân bằng không? Đó là những lực nào?
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