Go to: Course homepage, Lectures and Homework, TT-system

Instructor’s informal sessions:

• Tuesday 3:30-4:20, WAG 420
• Friday 4-5pm, RLM4.102.

Lecture 21: Chapter 10 Systems of particles

• Motion of one body and extended one-body system (There is only one acceleration)
• Newton’s 2^nd law revisit.

Example: Elastic collision with a wall.

• Momentum of a two body system.

Example Cannon ball and the carriage

• Center of mass: Effective one-body with M and v_cm (or P_cm)

o Center of mass (cm) coordinates of a two-body system

o cm coordinates of a many-body system

§ summation form

§ integral form

• Determine the cm of a body by inspection
• The combination rule
• Center of mass of a triangular plate

Reminders:

• Midterm 2 tonight. 7pm (be there by 6:50pm). Wel 2.224.
• Midterm 2 covers Chapters 5-9 and hw4-7 (unit #2). Also pay attention to today’s lecture.
• Read Advice on taking an exam. This link is also on our homepage.