Bài kiểm tra định kỳ lần II môn: Vật lý 8

Câu 1: Công cơ học được dùng trong trường hợp nào? công cơ học phụ thuộc vào yếu tố nào?

Câu 2: Viết công thức tính công suất? tên gọi và đơn vị đo của các đại lượng có mặt trong công thức?

 

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Trường THCS Dương Thủy Bài kiểm tra định kỳ lần II Họ và tên :. Môn : Vật lý Lớp : 8 Thời gian : 45 phút Điểm Nhận xét của giáo viên Đề A Câu 1 : Công cơ học được dùng trong trường hợp nào ? công cơ học phụ thuộc vào yếu tố nào ? ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ Câu 2 : Viết công thức tính công suất ? tên gọi và đơn vị đo của các đại lượng có mặt trong công thức ? ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ Câu 3 : Khi nào vật có động năng ? động năng của vật phụ thuộc vào những yếu tố nào ? lấy ví dụ về vật có động năng ? ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ Câu 4: Mũi tên được bắn đi từ cái cung là nhờ năng lượng của mũi tên hay của cái cung ? Đó là dạng năng lượng nào ? ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ Câu 5 : Một cần cẩu nâng một vật nặng 2000kg lên cao 30m hết 5 phút . Tính công suất của cần cẩu ? Tóm tắt Giải 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Trường THCS Dương Thủy Bài kiểm tra định kỳ lần II Họ và tên :. Môn : Vật lý Lớp : 8 Thời gian : 45 phút Điểm Nhận xét của giáo viên Đề B Câu 1 : Phát biểu dịnh luật về công ? ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ Câu 2 : Viết công thức tính công cơ học  ? tên gọi và đơn vị đo của các đại lượng có mặt trong công thức ? ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ Câu 3 : Khi nào vật có thế năng hấp dẫn  ? Thế năng hấp dẫn của vật phụ thuộc vào những yếu tố nào ? lấy ví dụ về vật có thế năng hấp dẫn  ? ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ Câu 4: Búa đập vào đinh làm đinh ngập sâu vòa gỗ . Đinh ngập sâu vào gỗ là nhờ năng lượng nào  ? Đó là dạng năng lượng gì  ? ..........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................

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