Cheetah
__________________ is the ability of a fluid -- a liquid or gas to exert an upward force on an object immersed in it.
Buoyancy.
What is the force pushing up on the ship?
The Greek mathematician who discovered buoyancy?
Archimedes.
This Greek mathematician found that the buoyant force on an object is equal to the weight of the fluid _______________________ by the object.
displaced.
Rocks __________ and rubber _____________.
sink; floats.
The water that moves up as you put an object into a liquid.
What kind of wood is better for starting a fire?
Pine.
Which type of wood sinks more into the water?
Oak.
He was a French scientist in the years 1623-1662 who discovered pressure.
Blaise Pascal.
This is why when you squeeze one end of the toothpaste, toothpaste emerges from the ______________ _____________.
Butter. Not really, its -- Other end.
Right now, ______________ from the air is pushing on you from all directions.
Pressure. (air)
______________ is force exerted per unit area.
Pressure.
What is the formula for pressure?
FORCE/AREA (F/A)
Auto repair shops often make use of _____________ ___________, which move heavy loads in accordance with Pascals principle.
Hydraulic lifts.
How does a hydraulic lift work? Explain.
This was a Swiss scientist (1700-1782) who studied the properties of moving fluids.
Daniel Bernoulli. (Bologna)
According to Bernoulli's principle, as the velocity of a fluid increases, the pressure exerted by that fluid ____________________.
Describe how a water hose sprayer is able to spray the insecticide/herbicide without it all coming out at once?
The velocity of the water increases, creating a low pressure in the container, actually allowing the substance to gradually pick up into the stream and leave.
______________ is the resistance of a fluid to flowing.
Viscosity.
What causes viscosity?
The ability of the material to pull the other end of the substance with it.
Which is more viscous? Water or Honey?
Honey.
Which is more viscous? Syrup or dish soap?
Dish soap. (Without water)
What other objects in our world today use hydraulics?
Door openers, Cars, Tractors.
How is a giant aircraft carrier that can weight up to 100,000 tons still be able to not sink?
It's hollow!
DAILY DOUBLE
What is the name of the sickness that you can get at high elevations due to high elevations and pressures and lack of oxygen?
Altitude sickness.