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INDEX B6 : FLUID MECHANICS

B6.02 BERNOULLI BALL

Levitate a ball in the exhaust of a vacuum cleaner.

B6.03 FLUID FRICTION

When a real fluid flows along a pipe there is a gradual drop in pressure.

B6.04 VENTURI TUBES

Shows that when a fluid flows in a pipe of varying cross section, the pressure is greatest where the diameter is greatest.

B6.06 HYDRAULIC PRESS

A working model of a hydraulic press, capable of crumpling pieces of pipe.

B6.07 ARCHIMEDES' PRINCIPLE DRY

Demonstrates bouyancy in air. In air two objects weight the same as shown by a balance. When the chamber is evacuated the larger object sinks

B6.08 ARCHIMEDES' PRINCIPLE WET

When an object is submerged in water it weighs less than in air. From the volume of water displaced, the density of the object can be calculated.

B6.09 RISING BALL

A funnel is connected to an air supply and inverted over a ping pong ball on the lecture bench. When air flows through the funnel, the ball rises, against the flow.

B6.11 MOVING CANS

Blowing air between two nearby cans causes them to come together.

B6.12 SPINNING CUP

A styrofoam cup is dropped without spin, whereby it falls straight down, and with spin, whereby it follows a curved trajectory as it falls.

B6.14 SPECIFIC GRAVITY

A beam balance has an "empty" paper bag hanging from one arm, balanced by weights hanging from the other. Carbon dioxide vapor is poured into the bag, which descends. (Warning: Uses consumable supplies, requires advance notice.)

B6.15 BERNOULLI CART

A cylinder is mounted vertically on a dynamics cart and is made to spin about its axis. When a stream of air is blown across the rotating cylinder by a fan, the cart rolls to the side.

B6.16 MANOMETER

A mercury manometer is used to measure air pressure.

B6.17 TWO COKE BOTTLES

Two Coke bottles are mounted mouth-to-mouth, with the lower one almost full of water. When inverted, the water flows turbulently. But if the bottles are swirled, the flow is smooth.

B6.18 CARTESIAN DIVER

The height of the diver can be controlled by varying the pressure.

B6.19 HYDROMETER

A hydrometer for illustrating a common practical use of Archimedes Principle.

B6.20 DEPTH AND PRESSURE

A plastic chamber with thin membranes on each end is lowered into a tank of water. When the chamber is horizontal, the membranes are pushed in equally, showing that pressure at a given level is independent of direction. When the chamber is vertical, the upper membrane is pushed in less than the bottom membrane, showing that pressure increases as the depth increases.

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