Question

define thrust,pressure,buoyancy

Answer 1

The ability or tendency of something to float in water or any ither fluid is called buoyancy.
Thrust is a reaction force described quantitatively by Newton's second and third laws.
Pressure is the force exerted on the surface per unit area. It's unit is pascal.

Answer 2

here is your answer....

THRUST:The force exerted perpendicular to the surface of the area is called thrust.
PRESSURE:Thrust per unit area is called pressure.
BUOYANCY:density of an object per density of the water