必修5 Module 5 课下主题训练 体育活动、大型体育赛事、体育与健康、体育精神（Word练习）-【新高考方案】2024高考英语一轮复习（老教材 新高考 外研版）

色学科网书城■ 品牌书店·知名教辅·正版资源 b.zxxk.com 您身边的互联网+教辅专家 Module 5 。课下主题训练 体育活动、大型体育赛事、 体育与健康、体育精神 1解 If we jump in the air as high as possible,we can stay off the ground for about half a second.Michael Jordan could stay airborne for almost one second while ski jumpers are able to do that for five to seven seconds as they travel about the length of a football field through the air.So how do they do this? Three major concepts from physics are at play in the ski jump:gravity,lift and drag.Gravity pulls any object in flight down toward the ground and there is nothing athletes can do to lessen its effectBut athletes also interact with the air as they move.It is this interaction that can produce lift,an upward force produced by air pushing on an objectIf the force produced from lift roughly balances the force of gravity,the object can fly.The same interaction also produces drag.It resists the forward motion of any object and slows it down. In the ski jump,jumpers start high up on a slope and then ski downhill to generate speed Just before they reach the end of the slope,they jump.Once jumpers are in the air,the fun physics begins.They use careful body positioning to maximize lift while minimizing drag.To do this,they adjust their skis and bodies to keep nearly parallel (to the ground and place their skis in a V-shape just outside the form of the body.This position increases the surface area that generates lift and puts them in the ideal angle of attack that will also maximize liftAs drag reduces the speed of the jumpers,lift decreases and gravity continues to pull them.They will begin to fall faster and faster until they land. As you tune in to the Olympics and wonder at the physical power of the athletes,take a moment to consider their mastery of the concepts of physics. 萨欧得划出璃等 1.What does the underlined word"this"in Paragraph 1 refer to? A.Staying longer in the air. B.Traveling forward slower. C.Falling down the hill faster. D.Jumping higher than average people. 新递闾题知this随的hey”