8.01

*Physics I: Classical Mechanics*, Fall 1999

Prof. Walter Lewin

**Course Material Related to This Topic:**

Definition, with example and explanation that object acts with all mass at CM.

- Watch video clip from Lecture 15 (35:39 - 46:23)
Center of Mass

8.01

*Physics I*, Fall 2003

Prof. Stanley Kowalski

**Course Material Related to This Topic:**

Definition, with examples; methods for finding center of mass of groups of particles and of solid bodies; mass distribution in terms of local density.

Center of mass of an area of constant thickness, with examples; motion of the center of mass; internal and external forces, with examples; energy of a system of particles; variable mass motion, with rocket example.

Definition of center of mass, with examples; methods for finding center of mass of groups of particles and of solid bodies; mass distribution in terms of local density

*8.01T Physics I*, Fall 2004

Prof. Walter Lewin

**Course Material Related to This Topic:**

Locating the center of mass of the Earth-Sun system.

- Complete practice problem 2
- Check solution to practice problem 2

Demonstrations showing CM of joined blocks at constant velocity; CM of racket in parabola.

- 8.01
*Physics I: Classical Mechanics*, Fall 1999

Prof. Walter Lewin

**Course Material Related to This Topic:**

- Watch video clip from Lecture 15 (46:23 - 52:30)
Motion of the Center of Mass

Two-dimension elastic collisions, with example; ballistic pendulum; definition and properties of collisions; collisions and kinetic energy in center of mass frame of reference.

8.01

*Physics I*, Fall 2003

Prof. Stanley Kowalski

**Course Material Related to This Topic:**

Power defined, with equation (P = F*v); impulse defined; center of mass defined; velocity and momentum of center of mass.

8.01L

*Physics I: Classical Mechanics*, Fall 2005

Dr. George Stephans

**Course Material Related to This Topic:**

Momentum and change of momentum defined, with equations; strategies for solving momentum and impulse problems; collisions and conservation of momentum; center of mass.

8.01T

*Physics I*, Fall 2004

Dr. Peter Dourmashkin, Prof. J. David Litster, Prof. David Pritchard, Prof. Bernd Surrow

**Course Material Related to This Topic:**

4-part problem; two balls collide at angle; finding momentum, speed before and after, and velocity of center of mass. Solutions are included after problems.

8.01

*Physics I*, Fall 2003

Prof. Stanley Kowalski

**Course Material Related to This Topic:**

- Complete exam problem 1