1. Chapter 6 Force and Motion - II 第 6 章 力與運動 ( 二 )

2. Chapter 6 Force and Motion - II 6-1 What is Physics? 6-2 Friction 6-3 Properties of Friction 6-4 The Drag Force and Terminal Speed 6-5 Uniform Circular Motion

3. 6-1 What is Physics? frictional force 摩擦力 drag force 阻力 centripetal force 向心力

4. 6-2 Friction static frictional force 靜摩擦力 f s kinetic frictional force 動摩擦力 f k cold-weld 冷熔接

6. The mechanism of sliding friction

7. 6-3 Properties of Friction

8. Sample Problem

10. 6-4 The Drag Force and Terminal Speed fluid 流體 drag force 阻力 D drag coefficient 阻力係數 C terminal speed 終端速率

12. shot 鉛球 shot put 擲鉛球 sky diver 高空跳傘者 parachutist 跳傘者

15. 6-5 Uniform Circular Motion A centripetal force accelerates a body by changing the direction of the body’s velocity without changing the body’s speed.

17. Sample Problem

18. Circular Motion loop-the-loop 騎單車翻圈子、倒飛觔斛 negative lift 負升力 Men in Black MIB 星際戰警 sedan 轎車 the verge of V-ing 瀕臨 …… banked 傾斜 (tilted) bank 傾斜行駛

19. Sample problem

20. Sample Problem