elastic collisions
<img width="125" height="100" src="https://scienceres-edcp-educ.sites.olt.ubc.ca/files/2012/08/sec_phys_momentum_collisions_centerofmass-125x100.jpg" class="attachment-post-thumbnail size-post-thumbnail wp-post-image" alt="" decoding="async" />
Center of Mass
<img width="125" height="100" src="https://scienceres-edcp-educ.sites.olt.ubc.ca/files/2012/08/sec_phys_circleMotion_semicircles-125x100.jpg" class="attachment-post-thumbnail size-post-thumbnail wp-post-image" alt="" decoding="async" loading="lazy" />
Semicircles
<img width="125" height="100" src="https://scienceres-edcp-educ.sites.olt.ubc.ca/files/2012/08/sec_phys_momentum_collisions_bouncingballs-125x100.jpg" class="attachment-post-thumbnail size-post-thumbnail wp-post-image" alt="" decoding="async" loading="lazy" />
Bouncing Balls
<img width="125" height="100" src="https://scienceres-edcp-educ.sites.olt.ubc.ca/files/2012/07/sec_phys_momentum_collisions_collidingBlock-125x100.jpg" class="attachment-post-thumbnail size-post-thumbnail wp-post-image" alt="" decoding="async" loading="lazy" />