Lực và phản lực, vật lí lớp 10 dễ hiểu

Khái niệm lực và phản lực:

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Biểu thức của định luật III Newton:

[vec{F_{12}}=-vec{F_{21}}]chọn hệ quy chiếu gắn với vật 1 thì F$_{12}$ là lực tác dụng còn F$_{21}$ là phản lực và ngược lại.

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Đặc điểm của lực và phản lực

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Ví dụ về lực và phản lực.

Một vật nằm yên trên mặt phẳng ngang: lực nén lên mặt phẳng ngang gọi là áp lực N’ có phương chiều như hình vẽ, phản lực của mặt phẳng ngang tác dụng ngược lại vật một lực gọi là Nvề mặt độ lớn N’=N=trọng lực P. Ta có N và N’ là hai lực trực đối vì đặ...

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Bài tập vận dụng định luật III Newton

Bài 1. Trên mặt nằm ngang không ma sát, xe một chuyển động với độ lớn vận tốc 5 m/s đến va chạm vào xe hai đang đứng yên. Sau va chạm, bật lại với tốc độ 150 cm/s, xe hai chuyển động với độ lớn vận tốc 200 cm/s. Biết khối lượng xe hai là 400 g. Tính khối lượng xe một.Bài 2. Hai quả cầu chuyển động trên mặt phẳng nằm ngang, quả cầu 1 chuyển động với vận tốc 4m/s đến va chạm vào quả cầu thứ hai đang đứng yên. Sau va chạm cả hai quả cầu chuyển động theo hướng cũ của quả cầu 1 với cùng vận tốc 2m/s. Tìm tỉ số khối lượng m1/m2

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7.4.3PHP Version2.29sRequest Duration42MBMemory UsageGET webstories/{key}-a{id}.htmlRoute
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