If a small shear force is applied on a certain element and then removed, and the element regains it's original position, what kind of an element can it be? a) Solid b) Liquid c) Fluid d) Gas What type of matter does not have or does not form a free surface? a) Solid b) Liquid c) Fluid d) Gas What do you call a field of study that focuses on fluid at rest? a) Fluid Mechanics b) Fluid Statics c) Fluid Kinematics d) Fluid Dynamics