Bioscience quiz 3.txt

The buoyant force is the UPWARD force on an object from it's surrounding fluid. It determines the ability of an object to float in water.

Becauze of the differences in pressure between the top of the object (pushing down) & the bottom of the object (pushing up)

When an object is partially/fully submerged in a liquid, the amount of water that it has displaces is equal to the amount of upward force produced by the fluid.

• The reason objects sink is becauze the weight of the object is > than the amount of force being produced.
• If the force is > than it's weight, it will RISE
• if the force is = to the weight, it will float
• If the force is < than it's weight, it will sink

• The amount of force per unit area.
• P=Force/Area

By molecules colliding with the walls of the container, each time exerting pressure

Pressure is proportional to the depth. The deeper, the more pressure because of more water being displaced.

The pressure is = to the density of the object.

It is the measure of how easily molecules pass eachother. If a fluid is more viscous, it means it will flow slower.

The attractive forces between molecules.

Density is how much mass is in a given unity of volume. The more mass per volume, the greater the density.

The greater the density, the greater pressure

Refers to an object when it is fully immersed in water. When it is immersed it displaces fluid to 'fit' in the water.

It will float, because

• Cohesion refers to the attraction of like molecules to eachother (gay molecules)
• Adhesion refers to the attraction between unlike molecules (straight molecules)

• Laminar - when fluid flows in parrallel layers next to eachother with no disruptions. (ordered)
• Turbulent - has irregular movements of the particles. (in no order)

When an incompressible fluid is put through a narrow restriction, it tends to flow fasted