FORCES & FLUIDS

What is the equation for pressure?

• PRESSURE=AREA/FORCE
• PRESSURE=FORCE/AREA
• PRESSURE=MASS/VOLUME
• PRESSURE=VOLUME/MASS

If a fluid flows from area A to area B, then area B must be an area of lower

• temperature.     
• mass.           
• volume.
• pressure.

Why can a duck float on water but not on air?

• It is denser than water and less dense than air.
• It is less dense than water and more dense than air.   
• The duck likes water better.
• The duck doesn’t weigh much.

organ used by fish to stay afloat

• turbulence
• pascal
• swim bladder
• ballast tank

principle that is used to determine buoyant force

• Pascal’s principle
• Bernoulli’s principle
•  Archimedes’ principle
• Mr. James principle

What causes air to rush into a tornado?

• The air pressure is higher inside the tornado than outside.
• The air pressure is lower outside the tornado than inside.
• The air pressure is lower inside the tornado than outside.
• The air pressure is the same inside and outside the tornado.

Which of the following substances is less dense than air?

• water
• helium 
• ice           
• gold

Where is atmospheric pressure greatest?

• at the ocean
• where an airplane cruises
• in a mountainside city
• at the outer edge of the atmosphere

Why does water pressure increase as the depth of the water increases?

• The weight of the water above presses down due to gravity.
• The weight of the atmosphere due to gravity presses down on the water surface.        
• At greater depths, more water presses down from above, increasing water pressure
• All of the above.

principle that states that the pressure in a fluid decreases as the fluid’s velocity increases

• Archimedes’ principle
• Bernoulli’s principle
• Pascal’s principle
• Mr. James principle