Fluids
Name three fluids you need in order to live
Water, blood, and oxygen
How do you calculate density?
D= Mass/Volume
Which of these don't float?
Balloon (not inflated), cork, piece of cardboard, a paper clip
Paperclip
Fill in the blank:
Hydraulic system uses pressurized _____
Liquids
True or False:
The greater the viscosity, the higher the flow rate.
True
Which is not a fluid?
peanut butter, toothpaste, ketchup, and sand
sand
What is the definition of density?
The amount of mass packed into a given volume.
Would rubbing alcohol sink or float when put with water?
It would float
Pressure= ?
Force/Area
What's the difference between viscosity and flow rate?
Viscosity measures the thickness of a fluid, flow rate measures the speed/volume.
What happens to a fluid when it's heated?
The molecules gain kinetic energy, causing them to move faster.
Why does ice float on water?
The molecules are more spread out making it less dense when a solid.
What's the difference between sinking, floating, and rising?
Sinking- moves down, floating- stays at surface, rising- moves up
True or False
The Pneumatic system uses pressurized liquids to do work.
False
If 54ml of a fluid takes 12 seconds to flow out of a container, what is the flow rate.
4.5 (ml/sec)
Which is a fluid?
Rice, snow, quicksand, and salt
Quicksand
What is the density of soda if the mass (g) is 394 and the volume (ml) is 385?
1.03 (g/ml)
Why does a steel block sink, but a steel ship floats?
The ship is hollow so it fills up with air.
Fill in the blank:
_____ is the ability of a substance to become more compact when squezzed.
Compressibility
True or Flase
Motor oil in a car engine needs to be a low viscosity to work in winter.
True
Is putty a fluid?
Yes, ( putty is a viscoelastic fluid )
Which one of these is the most dense?
Platinum, Gold, and Lead
Platinum
Why is it easier to float in salt water than fresh water?
Salt water is more dense (so it'll push you upwards)
When you drink out of a straw, are you pulling up liquid or air?
The air (you are reducing the air pressure in the straw causing the liquid to rise)
Put these from most to least viscous:
Water, milk, gasoline, perfume
Milk, water, perfume, and gasoline