red sea scuba diving v ...msjdoyle.weebly.com/.../40204707/my_chapter_9_ppt1.pdf · mass verses...
TRANSCRIPT
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RED SEA SCUBA DIVING https://www.youtube.com/watch?v=bNucJgetMjE
• Which parts of this video relate to our unit on fluids?
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UNIT 2: FLUIDS
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THE HOOK
Look at page 323-333
Which parts of the photograph would likely sink if they are separated from the diver?
Which would float?
What might stay the same?
What makes this happen??
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THE HOOK
The answer is FORCES!
This chapter introduces you to dynamics- the study of why objects move!
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WHAT YOU WILL LEARN IN THIS CHAPTER
Explain why objects sink or float in a fluid
Describe how fluids react to pressure
Explain how compression of fluids can be used to create force
Describe the relationship among pressure, volume, and temperature of gases
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FORCE
Anything that causes a change in the motion of an object.
A push or pull.
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BALANCED FORCES ARE…
Equal in strength
Opposite in direction
No movement
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UNBALANCED FORCES ARE…
Unequal in strength
Cause a change in speed or direction
http://phet.colorado.edu/en/simulation/forces-and-motion-basics
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MASS VERSES WEIGHT…. (THE CHALLENGE-TRY NOT TO GET THIS SONG STUCK IN YOUR HEAD!)
Mass Weight
• Stays the same anywhere in the universe
• Kilograms (kg)
• A measure of the push or pull acting on an object.
• Measured in Newton (N)
https://www.youtube.com/watch?v=1whMAIGNq7E
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BUOYANCY- THE ANTI-GRAVITY FORCE
Why is it easier to do a handstand in the water than it is on the land?
Forces water exerts on the body
Gravity pulls you down, while buoyant forces are pushing you up!
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BUOYANCY- THE ANTI-GRAVITY FORCE
The upward force on an object submerged in or floating on fluids.
An object that floats has neutral buoyancy.
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BUOYANCY- THE ANTI-GRAVITY FORCE
The amount of buoyant force that would push up against the object immersed in the fluid equals the force of gravity or the weight of the fluid that the object displaces.
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SAY WHAT?!
an object will float if its buoyant force, when fully immersed, is greater than its weight (gravitational force)
An object will sink if its weight is greater than the buoyant force.
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BUOYANCY- THE ANTI-GRAVITY FORCE
Simulation
http://phet.colorado.edu/en/simulation/buoyancy
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WHICH WILL FLOAT, WHICH WILL SINK?
THINK PAIR SHARE!
1. Wooden boat vs. water
logged stick
2.Metal block vs. metal boat
3.A sealed empty water bottle
vs. full water bottle
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DENSITY AND BUOYANCY ARE RELATED
Why does one egg float in the water while the other one sinks?
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DENSITY AND BUOYANCY
If the density of the immersed object is greater than the density of the fluid, it will SINK.
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AVERAGE DENSITY- PAGE 340-341
The total mass of all substances that make up an object divided by the total volume.
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TECHNOLOGIES DEVELOPED
Personal floatation devices
Submarines
Hot air balloons
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PRESSURE
The force acting on a certain area of surface.
The larger the force, the greater the pressure.
The smaller the area, the greater the pressure.
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CALCULATING PRESSURE
The unit for pressure is the Pascal (Pa)
You can determine pressure if you know the force and the area.
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SAMPLE PROBLEMS
1. An aquarium is filled with water that weighs 10 000N. If the base of the aquarium has an area of 1.6 m², what pressure does the water exert on its base?
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SAMPLE PROBLEMS
2. If the atmospheric pressure is 101 200 Pa and you are holding your hand, the atmosphere is exerting a force on your hand. If the area of your palm is 0.006m², calculate the force on your hand.
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SAMPLE PROBLEMS
3. The weight of water in a glass is 4.9 N. If the water is exerting a pressure of 1700 Pa on the bottom of the glass, what is the area of the bottom of the glass?
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DETERMINE WHY
A person wearing snowshoes can walk across a section of deep, soft snow without sinking.
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DETERMINE WHY
The nozzle on a garden hose can be used to create a faster and slower flow of water
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ATMOSPHERIC PRESSURE- P. 355
The pressure exerted by the layers of air surrounding the Earth that are held by the Earth’s gravity (~160km above the Earth)
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PASCAL'S LAW
•Pressure applied to an enclosed fluid is transmitted with equal force throughout the entire container
•Basics of hydraulics and pneumatic devices
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HYDRAULICS
•The study of pressure in liquids
•Hydraulic systems: devices that transmit applied force through a liquid to move something else
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HYDRAULICS
•Hydraulic systems use liquids because they are incompressible (they cannot be squeezed into a smaller volume)
•Liquid must be in an enclosed tube or pipe
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HYDRAULICS
•Pressure produced will exert pressure in all directions equally
•This pressure will cause motion at the other end of the system •https://www.youtube.com/watch?v=Ft5tr26fY1k
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PNEUMATIC SYSTEMS
•Uses gas in an enclosed space
•Compressors are necessary as gases can be compressed. They build up air pressure
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PNEUMATIC SYSTEMS
•Compressors increase the pressure on a fluid and can transport the fluid through a pipe.
•As gases are compressible, the compressor also reduces the volume of a gas.
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PRESSURE AND VOLUME
•Increasing the pressure of a fluid will decrease the volume by the same amount
** Known as Boyle’s Law
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TEMPERATURE AND VOLUME
•Increasing the temperature of a fluid will increase the volume
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TEMPERATURE AND PRESSURE
•Increasing the temperature of a fluid will increase the pressure
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WHY DOES THIS SYMBOL APPEAR ON AEROSOL CANS?