Table of Contents

# Systems of Particles

## Prerequisites

Students should be able to:

- Write Newton's second law as a differential equation.
- - reduced mass

## In-class Content

- Derivation and Explanation of Center of Mass (Lecture, 15 minutes)
- Survivor Outer Space: A kinesthetic approach to introducing Center of Mass (Optional Kinesthetic Activity, 20 minutes)
- Assumptions about Central Force Motion (Lecture, 10 minutes)
- Derivation of Reduced Mass (Lecture, 20 minutes)

## Homework for Center of Mass

## Homework for Reduced Mass

- (FreeCoM)
*Determine whether several common forces in nature are central forces.* - (FreeCoMLG)
*Determine whether several common forces in nature are central forces.* - (ReducedMassLG)
*How does the reduced mass depend on the two original masses.?* - (UndoReduced)
*Once you have solved for the motion of the reduced mass, you must “undo” the substitutions that you made to find the motions of your original two masses.* - (SunJupiter)
*Get a sense for the position of the center of mass for planets in our solar system.*

add homework questions for reduced mass