de kiem tra
Bạn đang xem bản rút gọn của tài liệu. Xem và tải ngay bản đầy đủ của tài liệu tại đây (86.72 KB, 5 trang )
<span class='text_page_counter'>(1)</span>Hä vµ tªn : ........................................................... Líp : 8 §iÓm.... bµi kiÓm tra m«n vËt lý Thêi gian : 45 phót NhËn xÐt cña gi¸o viªn. ĐỀ 1. Caâu 1. 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. Thế nào là hai lực cân bằng? Một vật chịu tác dụng của hai lực cân bằng sẽ theá naøo khi: ....................................................................................................................................................................................... ....................................................................................................................................................................................... ....................................................................................................................................................................................... ....................................................................................................................................................................................... ....................................................................................................................................................................................... .................................................. a) Vật đang đứng yên? ....................................................................................................................................................................................... ....................................................................................................................................................................................... ................. .................................................................................................................................................................... ............................ b) Vật đang chuyển động?. ....................................................................................................................................................................................... ....................................................................................................................................................................................... ....................................................................................................................................................................................... .............................. Câu 3. Biểu diễn lực kéo tác dụng lên vật, có phương ngang, chiều từ trái sang phải, độ lớn 3000N, với tỷ xích tùy chọn ...................................................................................................................................................................................... ...................................................................................................................................................................................... .......................................................................................................................................................................................
<span class='text_page_counter'>(2)</span> ...................................................................................................................................................................................... ...................................................................................................................................................................................... ...................................................................................................................................................................................... ................................................................... Caâu 4. Đổi đơn vị cho các giá trị sau đây: a. 15 m/s = …... km/h. b. 72km/h =… …...m/s. c. 400m = …..........km. d. 0,5km = …..….....m. Câu 5. 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 Tóm tắt. Giải. ................................................................................................................................................................................... ....................................................................................................................................................................................... ....................................................................................................................................................................................... ....................................................................................................................................................................................... ....................................................................................................................................................................................... ....................................................................................................................................................................................... ....................................................................................................................................................................................... ....................................................................................................................................................................................... ....................................................................................................................................................................................... ....................................................................................................................................................................................... ....................................................................................................................................................................................... .................................. ....................................................................................................................................................................................... ....................................................................................................................................................................................... ....................................................................................................................................................................................... ....................................................................................................................................................................................... ....................................................................................................................................................................................... ....................................................................................................................................................................................... ....................................................................................................................................................................................... ....................................................................................................................................................................................... ....................................................................................................................................................................................... ....................................................................................................................................................................................... ....................................................................................................................................................................................... ....................................................................................................................................................................................... ........................................................................................................................................................................................
<span class='text_page_counter'>(3)</span> ....................................................................................................................................................................................... ....................................................................................................................................................................................... ....................................................................................................................................................................................... ....................................................................................................................................................................................... ....................................................................................................................................................................................... ..................................................................................................................................................................................... Hä vµ tªn : ........................................................... Líp : 8 §iÓm. bµi kiÓm tra m«n vËt lý Thêi gian : 45 phót NhËn xÐt cña gi¸o viªn. ĐỀ 2 Câu 1: 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: Đổi đơn vị cho các giá trị sau đây: a. 5 m/s = …?... km/h. b. 54km/h = …?...m/s. c. 250m = ….?.....km. d. 78km = ….?....m. Câu 3: Khi nào một vật được coi là chuyển động . đứng yên ? ……………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………… ……………………………………………….. Câu 4: 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 ). .................................................................................................................................................................................. .................................................................................................................................................................................. ...................................................................................................................................................................................
<span class='text_page_counter'>(4)</span> .................................................................................................................................................................................. .................................................................................................................................................................................. .................................................................................................................................................................................. .................................................................................................................................................................................. .................................................................................................................................................................................. .................................................................................................................................................................................. ........................................................................................... Câu 5: Một người đi xe đạp xuống một cái dốc dài 150m hết 30s. Khi hết dốc xe lăn tiếpmột 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 ? Tóm tắt. Giải. ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... .................................................................. ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ....................................................................................................................... ................................................................................................................................................................................... ....................................................................................................................................................................................
<span class='text_page_counter'>(5)</span> ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ........................................................................................................................
<span class='text_page_counter'>(6)</span>
