Ⅲ. 物理课程 Amy 在周五参与了一场特别的物理课,老师带领学生来到了学校操场旁的滑梯。老师要告诉学生什么呢？
跨学科 物理 Slides are simple but always fun. All you need to do is to climb up to the top and slide down. But did you know that there is science behind this simple playground equipment?
Isaac Newton said what goes up must come down. He was talking about gravity. Gravity is an invisible force(看不见的力量) that pulls everything down. Slides work because of gravity, ① that is not all.
You climb up the slide ② sit down. You are ready to go. Are you sliding down? No, not yet. Things stay still unless something makes them move. It is Newton's first law, ③ you have to give yourself a push to start the journey down.
Now you are sliding down. Do you feel you are slowing down a bit? When two things rub(摩擦) against each other, they cause friction. It is a force that works against the movement.
Without friction, you will slide down faster and faster to the bottom of the slide. It is dangerous, ④ that might be more fun.
At the bottom of the slide, you come to a full stop. Your feet touch the ground and add extra friction. Newton's first law also says moving things keep moving unless something makes them stop. So if you do not use your feet, you will fly off the slide and hurt yourself.
新考法 创新设问 Which of the following can be put into NO. 1 and NO. 2?
1.
B
2.
B
3.
C
4.
D
Questions: 1. 新考法 开放性试题 What fun class did you or will you have at your school? What's it about?
I will have a music class. The students will sing and act together in a music play.
2. What can you learn from it?
I can learn how to work with others to make the play better.
