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