Originally posted by smw6869
Can anyone explain what fictitious force is?
My name is Granny( G.)
First of all, it is friction force, not fictious force.
Friction force is a force that sort of blocks objects from moving due to brushing to other objects, gases, liquids. However, it cannot actually move something, only restrict a movement, so it's work will aways be negative or zero.
Some materials have interesting properties. For example Helium (the isotope with 4 protons) when cooled to ultra-low temperatures (4 kelvins) becomes 'supraviscose'. It can flow frictionlessly.