9l pressure and moments. p ressure what is the equation for calculating pressure? name 2 ways that...
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9L PRESSURE AND MOMENTS
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PRESSURE
What is the equation for calculating pressure?
Name 2 ways that pressure can be increased.
What are the units of pressure?
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CALCULATING PRESSURE
Pressure (N/cm2) = Force (N)
Area (cm2)
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AIM: TO INVESTIGATE HOW THE PRESSURE I EXERT ON THE GROUND CHANGES.
Body part/shoe
Area (cm2) Force (N) Pressure (N/cm2)
1 foot
2 feet
1 hand
2 hands
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CALCULATING PRESSURE
Pressure (N/cm2) = Force (N) b
Area (cm2)
e.g. Pressure = force ÷ area
= 700 ÷ 20
= 35 N/cm2
ALWAYS1. Formula2. Add numbers3. Answer4. Units
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WATER PRESSURE
What is water pressure?
Which direction does it act in?
How does it change with depth?
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SCUBA DIVING EXPERIMENTS
http://youtu.be/PavY_JmYyTs
http://youtu.be/HlZXDcSR-Z4
http://youtu.be/t8wFIMbMJvs
Polystyrene cup
http://www.sciencedump.com/content/what-happens-coffee-cup-2300-meters-depth-ocean
Mythbusters
http://youtu.be/YU2PSHeFSlA
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AIR PRESSURE
What is air pressure?
How does it change with altitude?
How can you increase air pressure?
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DEMOS
http://www.youtube.com/watch?v=_xB7q6bJ8k8
http://www.youtube.com/watch?v=QeAp3CuGjk8
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MOMENTS
What is a moment?
Complete this formula:
Moment ( ) =
What unit is a moment measured in?
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WHY DID THIS HAPPEN?
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BALANCINGLeft Right
Distance from fulcrum (m)
Mass (g) Weight (N)
Moment (Nm)
Distance from fulcrum (m)
Mass (g) Weight (N)
Moment (Nm)
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CONVERTING MASS TO WEIGHT
Mass (kg) = mass (g) ÷ 1000
Weight (N) = mass (kg) ÷ 10
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CALCULATING THE MOMENT
Moment (Nm) = Force (N) x distance (m)ALWAYS1. Formula2. Add numbers3. Answer4. Units
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LEVERS
What is a lever?
Name 5 examples of where we use levers.
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LETS LOOK AT A BIKE AND SOME TOOLS
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PLENARY
Find the lever and fulcrum
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Capsizing
http://youtu.be/S-FlN97Y3ok
World speed sailing record
http://youtu.be/qzkulFGa4Mc
Moth boat
http://youtu.be/1SN1gSkqvy0
L´Hydroptere
http://youtu.be/MdUyLxVa6xQ
Sailrocket 2 2012 record (125km/h)
http://youtu.be/pipGWQmerEQ
Windsurf speed record
http://youtu.be/t15LZ1Er-a8
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