Friction occurs because surfaces aren t flat Amount of friction depends on Types of materials in contact Amount of force pressing things together Smoothness of surfaces Friction can be useful or wasteful Good ?
(Friction; occurs; ) (surfaces; aren; t flat Amount of friction) (Friction occurs because surfaces aren t flat Amount of friction; depends; on Types of materials in contact Amount of force) (Types of materials in contact Amount of force; pressing together; things) Context(Types of materials in contact Amount of force pressing together,List([75, 145))):(Friction; can be; useful or wasteful)
Types of materials in contact Amount of force pressing together,List([75, 145))
Friction surfaces Friction occurs because surfaces aren t flat Amount of friction Types of materials in contact Amount of force Friction
occurs aren depends pressing together can be
t flat Amount of friction
on Types of materials in contact Amount of force
things
useful or wasteful