纸桥的设计与制作(国外英文资料).docVIP

纸桥的设计与制作(国外英文资料) Design and manufacture of paper bridges (life, hands and feet) In this lab activity, we will 1, take the form of grouping activities to cultivate the students cooperative spirit and orderly work ability. Through the display, competition and other activities, students cooperation and competition consciousness will be cultivated; 2, in the production process, to cultivate their own fear of difficulties, not follow the old regulations, the spirit of innovation. 3. Learning the science and technology production and understanding the main structure of the bridge. Through the design and manufacture of the paper bridge, it is understood in the exploration that the strength of the material is related to its geometry. 4, in the papers many kinds of bearing experiment research, paper bridge design and so on, we must learn to think independently 5. Cultivate students ability to cooperate and study with others. 6, through the design of the bridge, to improve the creative model skills, skills and considerable enjoyment. 7. Learn simple technical design. All activities Design and manufacture of paper bridge This background material 1. Knowledge background: The pressure and pressure Know the concept of pressure, pressure refers to the vertical pressure on the surface of the force. To understand the concept of pressure, pressure is the pressure per unit area of an object. The pressure of solid is related to the force area, and the cross section has a direct influence on the pressure. The greater the sectional area, the smaller the pressure The arch bridge: the arch waist slip will carry a box of matches, this shows that upwards the objects can withstand external pressure, its strength than arch at. The match box is pressed on the paper arch bridge and gives the paper arch a static external force, which is different from the bullet impact on the armored vehicle. Paper arch bridge, which resists static force, is called static strength. Our ancestors long ago discover