Fluid Mechanics

The vessels shown above all contain water to the same height. Rank them according to the pressure exerted by the water on the vessel bottoms, least to greatest.

• 1,2,3,4

• 3,4,2,1

• 4,3,2,1

• 2,3,4,1

• All pressures are the same

Archimedes' Principle states that... 

• The buoyant force acting on an object equals the volume of the fluid displaced by the object. 
• The buoyant force acting on an object equals the weight (force of gravity) of the fluid displaced by the object.
• The buoyant force acting on an object will always be equal. 

Which direction does buoyant force always push?

• downward
• upward
• all directions
• sponge bob

An object's density is a measure of how compact or heavy it is, in a given volume. Hence, if the object weighs 2kg with a volume of 1m³, the object will sink.

• True

• False

What is the unit of measurement for pressure?

• pascal
• grams
• milliters
• meters

A 2 m long steel cube rests on the floor. The pressure the cube exerts on the floor is 2000 Pa. Find the force of the cube.

• 0.001 N
• 1000 N
• 4000 N
• 8000 N

Find the volume of this piece of brass.  

• 50 g
• 10 cm
• 6 cm³
• 12 cm³

A fluid exerts 500 N of force over an area that measures .5 m².  What is the pressure exerted by the fluid?

• 1,000 Pa
• 2,000 Pa
• 750 Pa
• 250 Pa

Frank has an eraser. It has a mass of 4g, and a volume of 2cm³. What is its density?

• 8 g/cm³
• 2 g/cm³
• 1/2 g/cm³
• 24 g/cm³

Diagram shows the design of a dam. Why does the thickness of the dam increase with its depth?

• The design of this structure is stronger.

• Water pressure increases with depth.

• The cost of construction is lower.

• Water pressure acts uniformly in all directions.