surfaces in contact are at rest RF ex. riding a bike, bowling fluid Law of Universal Gravitation surfaces in motion move through liquid or gas replace sliding with rolling gravity less force pushing together direction friction friction harmful increases as the speed of the object increases weight mass smooth the surface ex. SF combing hair, writing add a lubricant like oil, wax or grease rolling ex. SF a book resting on a desk static friction helpful FF ex. airplane, swimmer ice glass tile sandpaper carpet gravel friction force sliding surfaces in contact are at rest RF ex. riding a bike, bowling fluid Law of Universal Gravitation surfaces in motion move through liquid or gas replace sliding with rolling gravity less force pushing together direction friction friction harmful increases as the speed of the object increases weight mass smooth the surface ex. SF combing hair, writing add a lubricant like oil, wax or grease rolling ex. SF a book resting on a desk static friction helpful FF ex. airplane, swimmer ice glass tile sandpaper carpet gravel friction force sliding
(Print)
surfaces in contact are at rest
RF ex. riding a bike, bowling
fluid
Law of Universal Gravitation
surfaces in motion
move through liquid or gas
replace sliding with rolling
gravity
less force pushing together
direction
friction
friction harmful
increases as the speed of the object increases
weight
mass
smooth the surface
ex. SF combing hair, writing
add a lubricant like oil, wax or grease
rolling
ex. SF a book resting on a desk
static
friction helpful
FF ex. airplane, swimmer
ice
glass tile
sandpaper carpet
gravel
friction
force
sliding
