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thaynagel
2 năm trước
Hãy giải thích các hiện tượng sau và cho biết trong các hiện tượng này ma sát có ích hay có hại: a) Khi đi trên sàn đá hoa mới lau dễ bị ngã. b) Ôtô đi vào chỗ bùn lầy, có khi bánh quay tít mà xe không tiến lên được. c) Giàyđi mãi đế bị mòn. d) Phải bôi nhựa thông vào dây cung ở cần kéo nhị (đàn cò). _____GIẢI THÍCH CHI TIẾT GIÙM MÌNH Ạ, NO CUPY NHA_____
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