Khi một chiếc xe mô hình trượt không vận tốc đầu từ đỉnh dốc xuống chân dốc (Hình 6), nếu lờ qua tất cả ma sát, so với thế năng ở đỉnh dốc thì động năng của xe tại chân dốc

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Answer 1

có vẻ như nó đang hỏi về sự bảo toàn năng lượng của một chiếc ô tô đồ chơi đang trượt xuống dốc.

Nếu ô tô đồ chơi không có ma sát bắt đầu dừng ở đỉnh dốc và trượt xuống (hình 6) thì so với thế năng của trọng trường ở đỉnh dốc thì động năng của ô tô ở chân dốc sẽ là bằng thế năng mà ô tô có. ở đỉnh dốc. Điều này là do năng lượng được bảo toàn và trong trường hợp không có ma sát thì không có năng lượng nào bị mất do các lực không bảo toàn. Do đó, đáp án là động năng của ô tô ở chân dốc sẽ bằng thế năng mà ô tô có được ở đầu dốc.


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