Movement Analogies

 

 

 

 

 

Pulley

 

http://etc.usf.edu/clipart/53300/53371/53371_pulley_sm.gif

 

 

Hinge

http://cfnewsads.thomasnet.com/images/cmsimage/image/modern-chrome-hinge.jpg

 

 

 

Gears

 

 

http://www.learnersdictionary.com/media/ld/images/legacy_print_images/gear.gif