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kha.minhdo199
2 năm trước
Biểu diễn lực a) Một vật A có khối lượng 40kg nằm trên mặt đất. Tính trong lượng của vật và biểu diễn trong lực tác dụng lên vật theo tỉ xích 1cm=200N B) Biểu diễn lực kéo tác dụng lên vật B có độ lớn 15N có phương nằm ngang, chiều từ trái sang phải (tỉ xích 1cm-5N) C) Biểu diễn lực kéo tác dụng lên vật C, phương xiên góc 30° so với phương ngang,chiều từ dưới lên trên và từ trái sang phải, có độ lớn là 30N (ti xích 1cm ứng với 10N)
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