Chuyện quả táo của Newton – Nguồn gốc ra đời Định luật vạn vật hấp dẫn

Chuyện quả táo của Newton

Vào một ngày mùa thu, Newton ngồi trên chiếc ghế trong vườn hoa đọc sách, bỗng nhiên một quả táo từ cây rơi xuống “bịch” một tiếng trúng đầu Newton. Ông xoa đầu, nhìn quả táo chín lăn xuống vũng bùn. Quả táo đã cho ông một gợi ý làm ông nghĩ miên man.

Quả táo chín rồi, tại sao lại rơi xuống đất? Tài vì gió thổi chăng? Không phải, khoảng không rộng mênh mông, tại sao lại phải rơi xuống mà không bay lên trời? Như vậy trái đất có cái gì hút nó sao? Mọi vật trên trái đất đều có sức nặng, hòn đã ném đi rốt cuộc lại rơi xuống đất, trọng lượng của mọi vật có phải là kết quả của lực hút trái đất không?

Sau này Newton nêu ra: Mọi vật trên trái đất đều chịu sức hút của trái đất, mặt trăng cũng chịu sức hút của trái đất, đồng thời trái đất cũng chịu sức hút của mặt trăng; Trái đất chịu sức hút của mặt trời, mặt trời đồng thời cũng chịu sức hút của trái đất. Nói một cách khác là vạn vật trong vũ trụ đều có lực hấp dẫn lẫn nhau, vì có loại lực hấp dẫn này mà mặt trăng mới quay quanh trái đất, trái đất mới quay quanh mặt trời.

Chuyện quả táo rơi xuống đất chứng tỏ trái đất có lực hút quả táo, đương nhiên quả táo cũng có lực hút của quả đất, nhưng lực hút của trái đất đối với quả táo lớn nên quả táo rơi xuống đất. Nếu ta coi mặt trăng là một quả táo khổng lồ, như vậy trái đất cũng có lực hút nó, vậy tại sao nó không rơi xuống mặt đất? Vì mặt trăng là một quả táo lớn, sức hút của trái đất đối với nó không đủ để làm nó rơi xuống đất, chỉ có thể làm nó quay quanh trái đất mà thôi. Đối với mặt trời thì trái đất cũng là một quả táo khổng lồ, nó quay quanh mặt trời.

Vào buổi tối khi nhìn lên bầu trời thấy vô vàn những vì sao đang nhấp nháy, giữa chúng đều có lực hút lẫn nhau. Đây chính là định luật “Vạn vật hấp dẫn” nổi tiếng của Newton.

Đọc thêm: Tìm hiểu hệ mặt trời.

Quả táo của New ton

(nguồn ảnh:

Tiểu sử của Newton

Một vài dấu mốc:

  • Isaac Newton (1642 – 1727) – nhà vật lý, toán học nước Anh, người được thế giới tôn là “người sáng lập ra vật lý học cổ điển”.
  • Thời gian còn là sinh viên, Niutơn đã tìm ra nhị thức trong toán học giải tích, được gọi là “nhị thức Niutơn”.
  • Năm 27 tuổi, ông được cử làm giáo sư toán ở trường Đại học nơi ông học.
  • Năm 30 tuổi, ông được bầu làm hội viên Hội khoa học hoàng gia Anh (Viện hàn lâm) và 23 năm cuối đời, ông làm chủ tịch Hội khoa học hoàng gia Anh. Ông còn là hội viên danh dự của nhiều Hội khoa học và viện sĩ của nhiều Viện hàn lâm.
  • Cống hiến lớn khiến tên tuổi ông trở thành bất tử là Ba định luật về chuyển động đặt cơ sở lý luận cho lực học kinh điển, quan trọng nhất là“Nguyên lý vạn vật hấp dẫn”. Đây là nguyên lý cơ sở cho những phát minh vật lý học, cơ học, thiên văn học trong nhiều thế kỷ.

Tham khảo:

Tìm hiểu thêm: Giúp bé khám phá thế giới.

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