14 Parachute14降落伞 A parachute is a special tool that uses air resistance to achieve a slow descent from high altitudes.降落伞是一种利用气阻力实现从高空缓慢下降的专用工具。 It has since developed into an air resistance parachute with various functions它后来发展成具有各种功能的空气阻力伞 Collect text and picture information about landing.搜集有关降落的文字、图片资料。 Prepare the following materials: handkerchief, plastic film, nuts, rope, scissors, etc.准备以下材料：手绢、塑料薄膜、螺母、绳、剪刀等。 Under what circumstances do people use parachutes? What do they do?人们在什么情况下使用降落伞?它们有什么作用? Make a parachute and play with it. What do you find?制作降落伞,玩一玩。你有哪些发现? What are the factors that affect how fast or slow a parachute falls?影响降落伞下降快慢的因素有哪些呢 What we found我们的发现 Problems that were not solved没有解决的问题 Design a practical parachute and write down the design.设计实用的降落伞,把设计方案写下来。 My design我的设计方案 Expected fall speed: ( ) meters per second预计下落速度:每秒（ ） 米 Surface area and shape of parachute (drawing)伞面展开面积及伞形(绘图) Rope length绳长 Fixing method固定方式 Design basis设计依据 Other notes其他说明 |
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