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

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

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.

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

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.

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

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

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

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

Solution (PDF)

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.