The strength of the force of friction depends on
        the types of surfaces involved
        how hard the surfaces push together

    Types of Friction
 

Static Friction              force acting on object when not moving                              requires more force to start the motion of the stationary object

 
 
 

Sliding Friction              two solid surfaces slide over each other  Rolling Friction              object uses a rolling action to move              acts to reduce the potential friction

 
 

Fluid Friction              object moves through a fluid              sometimes acts to reduce the potential friction