Đề kiểm tra số 1 môn Vật lý 8

Trường THCS Dương Thủy BÀI KIỂM TRA SỐ 1 Họ và tên : .............................................................................. Môn : Vật lý Lớp : 8 Thời gian : 45 phút Điểm Nhận xét của giáo viên ĐỀ 1 Câu 1. ( 2 điểm ) Thế nào là chuyển động đều , chuyển động không đều ? Viết công thức tính vận tốc trung bình của chuyển động không đều ? ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ........................................................................................................................................................................................................................ ......................................................................................................................................................................................................................... ........................................................................................................................................................................................................................ ......................................................................................................................................................................................................................... Câu 2. ( 1.5.điểm ) Thế nào là hai lực cân bằng? Một vật chịu tác dụng của hai lực cân bằng sẽ thế nào khi: a) Vật đang đứng yên? ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... b) Vật đang chuyển động? ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... Câu 3.( 2 điểm ) Biểu diễn lực kéo tác dụng lên vật, có phương ngang, chiều từ trái sang phải, độ lớn 3000N, với tỷ xích tùy chọn ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... Caâu 4. ( 1.5 ñieåm ) Đổi đơn vị cho các giá trị sau đây: 15 m/s = …?... km/h b. 72km/h = …?...m/s ......................................................................................................................................................................................................................... ........................................................................................................................................................................................................................ c. 400m = ….?.....km d. 0,5km = ….?....m. ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... Câu 5. ( 3 điểm ) Một người đi xe máy trên đoạn đường đầu dài 78 km với vận tốc 30km/h, đi đoạn đường tiếp theo dài 15 km mất 24 phút. Tính: a) Thời gian đi quãng đường đầu ? b) Vận tốc trung bình của người đó đi hết cả quãng đường ? ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... Trường THCS Dương Thủy BÀI KIỂM TRA SỐ 1 Họ và tên : .............................................................................. Môn : Vật lý Lớp : 8 Thời gian : 45 phút Điểm Nhận xét của giáo viên ĐỀ 2 Câu 1: (2 đ) Độ lớn của vận tốc đặc trưng cho tính chất nào của chuyển động ? Công thức tính vận tốc? Đơn vị vận tốc? ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... Câu 2: (2 đ) Đổi đơn vị cho các giá trị sau đây: 5 m/s = …?... km/h b. 54km/h = …?...m/s ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... c. 250m = ….?.....km d. 78km = ….?....m ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... Câu 3: ( 2 đ) Khi nào một vật được coi là chuyển động ? đứng yên ? ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... Câu 4: ( 2 đ) ) Biểu diễn véc tơ lực sau. Lực kéo một vật sang phải, theo phương ngang, có cường độ 2000N.(chọn tỉ xích 1cm ứng với 500N ). ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ....................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... .. Câu 5: ( 2 đ) Một người đi xe đạp xuống một cái dốc dài 150m hết 30s. Khi hết dốc xe lăn tiếp một quãng đường nằm ngang dài 90 m trong 15s.Tính vận tốc trung bình trên quãng đường dốc, trên quãng đường năm ngang và trên cả hai quãng đường. ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... ......................................................................................................................................................................................................................... .........................................................................................................................................................................................................................