# 講者： 許永昌 老師 1. Contents Example: rocket Review of Circular Kinematics Action: the cause of the centripetal acceleration Circular orbits vs. Weightlessness.

## Presentation on theme: "講者： 許永昌 老師 1. Contents Example: rocket Review of Circular Kinematics Action: the cause of the centripetal acceleration Circular orbits vs. Weightlessness."— Presentation transcript:

Contents Example: rocket Review of Circular Kinematics Action: the cause of the centripetal acceleration Circular orbits vs. Weightlessness Fictitious Forces Action: Why does the Water Stay in the Bucket? 2

Example: Rocket ( 請預讀 P210~P212) A rocket of mass m is launched at a 45 o angle and then maintains the body of the rocket at 45 0. The thrust force is F thrust, and it is assumed that the mass and thrust remain unchanged. Find the motion of the rocket (1) in the absence of gravity. (2) with gravity. 3

Review of Circular Kinematics ( 請 預讀 P213~P214) 4 這一頁寫的是最一般的形式。

Review of Circular Kinematics ( 請 預讀 P226~P228) 5

Action: the cause of the centripetal acceleration ( 請預讀 P214~P218) 6

Circular orbits vs. Weightlessness ( 請 預讀 P219~P221) 7

Homework Student Workbook: 8.3 8.4 8.5 8.7 8.9 8.10 8

Fictitious Forces ( 請預讀 P222~P223) 9

Action: Why does the Water Stay in the Bucket? ( 請預讀 P223~P225) Purpose: To understand the reason. Objects: A Marble with a string. A bucket with soft foam blocks. Actions: Swing the string over the head. Fast  slow. Swing the bucket over the head. Fast  slow. Hint: 10

Summary of Part I ( 請預讀 P236) 11

Homework Student Workbook: P8-5~P8-6. Textbook: 8.10 8.17 8.22 8.37 8.60 Terms and Notation ( 只有兩個單字 ) 12

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