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bach5997
2 năm trước
câu 1 trong các trừơng hợp dưới đây trường hợp nào ma sát có ích a,ma sát làm mòn lốp xe b,ma sát làm ô tô qua đc chất lầy c,ma sát sinh ra giữa trục bánh xe d,ma sát khi vật trượt lên mặt sàn Câu 2:1 người đi quãng đường dài 1,5km với vận tốc 10m/s.thời gian để ng đó đi hét quãng đg là t=0,15h t=15 giây t=2,5' t=14,4' câu 3:trong các chuyển động sau chuyển động nào do quán tính a,hòn đá lăn từ trên núi xuống b,xé máy chạy trên đường c, lá rơi từ núi cao xuống d,xe đạp chạy sau khi thôi không đạp xe nữa
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