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TRƯỜNG ĐẠI HỌC SƯ PHẠM
        TP.HCM
     KHOA VẬT LÝ


  LỰC MA SÁT LĂN

      NHÓM 4 IN 1
Búng
                            Tại sao hòn viên bi
                                 Vì sao bi lăn
                           đượclăn chậm dần
                                  đoạn đường
        Fmsl                     rồi dừng lại?
                          khá xa mới dừng lại?


Thí nghiệm
   Búng một viên bi lăn trên mặt sàn
   Có lực ma sát lăn do mặt sàn tác dụng lên viên bi
   vì lực ma sát lăn rất nhỏ
Khi vật này lăn trên vật kia thì tại chỗ tiếp xúc giữa
hai vật xuất hiện một lực cản lại chuyển động lăn
của vật, lực đó gọi là lực ma sát lăn.
 -Hướng: Ngược hướng với vận tốc
                       Vậy lực ma sát lăn
 - Độ lớn: Fmst = µlN
                      xuất hiện ở đâu? Khi
  Chú ý: µl << µt     nào? Có tác dụng gì?
Ta có thể ứng dụng
được ma sát lăn vào
     đời sống?
Chế tạo bánh xe giúp phương tiện di chuyển dễ dàng hơn.
Chế tạo ổ bi,ổ trục giúp giảm thiểu sự mài mòn của trục bánh xe
Chế tạo con lăn nhằm di chuyển đồ vật dễ dàng hơn
Ma sát lăn

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Ma sát lăn

  • 1. TRƯỜNG ĐẠI HỌC SƯ PHẠM TP.HCM KHOA VẬT LÝ LỰC MA SÁT LĂN NHÓM 4 IN 1
  • 2. Búng Tại sao hòn viên bi Vì sao bi lăn đượclăn chậm dần đoạn đường Fmsl rồi dừng lại? khá xa mới dừng lại? Thí nghiệm Búng một viên bi lăn trên mặt sàn Có lực ma sát lăn do mặt sàn tác dụng lên viên bi vì lực ma sát lăn rất nhỏ
  • 3. Khi vật này lăn trên vật kia thì tại chỗ tiếp xúc giữa hai vật xuất hiện một lực cản lại chuyển động lăn của vật, lực đó gọi là lực ma sát lăn. -Hướng: Ngược hướng với vận tốc Vậy lực ma sát lăn - Độ lớn: Fmst = µlN xuất hiện ở đâu? Khi Chú ý: µl << µt nào? Có tác dụng gì?
  • 4. Ta có thể ứng dụng được ma sát lăn vào đời sống?
  • 5. Chế tạo bánh xe giúp phương tiện di chuyển dễ dàng hơn.
  • 6. Chế tạo ổ bi,ổ trục giúp giảm thiểu sự mài mòn của trục bánh xe
  • 7. Chế tạo con lăn nhằm di chuyển đồ vật dễ dàng hơn