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Terms
Floating/Sinking
Increase or Decrease?
Fluid Pressure Principles
Miscellaneous
100
A substance whose molecules move past one-another easily.
Fluid
100
The upward force exerted by a fluid on a submerged object.
Buoyant Force
100
People wearing snowshoes can walk without sinking because the increase in the area the shoe covers causes a _________ in pressure.
Decrease
100
When force is applied to a confined fluid, the change in pressure is transmitted equally to all parts of the fluid.
Pascal's Principle
100
What direction does fluid pressure act in?
All directions!
200
The amount of matter in a given amount of space.
Density
200
A measurement of the force of gravity acting on an object.
Weight
200
As your elevation increases, atmospheric pressure __________.
Decreases
200
This principle states that the buoyant force acting on a submerged object is equal to the weight of the fluid the object displaces.
Archimedes' Principle
200
Why aren't humans crushed by the air pressure around us?
Humans have fluids in their bodies that exert pressure outwards as well. The inward push of the air and the outward push of our fluids balance.
300
An amount of Force acting on a specific amount of area.
Pressure
300
An object will sink if the Buoyant Force acting on it is ________ than the force of gravity acting on it.
Weaker
300
As you go deeper under water, your ears hurt because the pressure that the water exerts on you _______.
Increases
300
This principle states that as the speed of a moving fluid increases, the pressure within the fluid decreases.
Bernoulli's Principle
300
Why can a 1000 N metal boat float when a 1000 N cube of the same metal sinks?
The shape of the boat displaces more water than the cube, which results in a stronger Buoyant force on the boat.
400
An upward force, like the one that an airplane experiences to keep it in the air.
Lift
400
An object weighs 100 N and displaces 300 N of water. What will happen to the object if placed in water?
The object floats
400
Bernoulli's principle states that as the speed of a moving fluid increases, the pressure that the fluid exerts __________.
Decreases
400
How does an airplane fly?
Bernoulli's Principle: The air moves faster on top of the wing than it does under the wing, causing an area of low pressure above the wing. The wing is pushed from high pressure to low pressure (up). If the upward force is as strong as gravity, the airplane stays in the air.
400
Why does ice float in water?
Ice expands when it freezes, meaning the same amount of mass takes up more space. Because of this, ice has a lower density than water and will float.
500
This tool is used to measure the air pressure in the atmosphere.
Barometer
500
How can submarines control when they float and sink?
Submarines can change their density by adding or removing water, which changes the amount of mass in the same amount of space.
500
When you apply a force to a confined fluid, the pressure inside the fluid __________.
Increses evenly (throughout the volume of the fluid).
500
How do car brakes work?
Pascal's Principle: A force is applied to a small area on one side of a hydraulic. The pressure inside the hydraulic increases everywhere by the same amount. The piston on the other side of the hydraulic has a greater area, which results in a greater force exerted. The force is applied as friction to the wheels, which slows them down.
500
Why does it get harder for a mountain climber to breathe as they climb a mountain?
To breathe, you increase the area of your lungs which decreases the pressure, and air flows in from the higher pressure outside. As altitude increases, the air pressure outside decreases. If you cant get the pressure in your lungs lower than the pressure outside, air will not flow in because it will always flow from high pressure to low pressure.