FORCES IN FLUIDS

Pressure in Fluids

• fluid pressure depends on depth
• greater the depth, the greater the pressure
• fluids include liquids and gases: they take the shape of their containers and will flow
• fluids flow from high pressure to low pressure ares
• P=F/A: pressure=force/area

Density & Buoyancy

• density is the ratio of mass to volume in a given substance D=m/v
• sinking: an object will sink if it is more dense than the fluid it is in or if it has greater weight than the buoyant force
• floating: an object will float if it is less dense than the fluid it is in or is equal to the buoyant force

Archimede's Principle

• displace: to take the place of
• principle: buoyant force on an object in a fluid is an upward force equal to the weight of the fluid it displaces