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