9L PRESSURE AND MOMENTS. P RESSURE  What is the equation for calculating pressure?  Name 2 ways that pressure can be increased.  What are the units.

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Presentation transcript:

9L PRESSURE AND MOMENTS

P RESSURE  What is the equation for calculating pressure?  Name 2 ways that pressure can be increased.  What are the units of pressure?

O NE OF THE SHARPEST KNIVES IN THE WORLD

C ALCULATING PRESSURE Pressure (N/cm 2 ) =Force (N) Area (cm 2 )

A IM : T O INVESTIGATE HOW THE PRESSURE I EXERT ON THE GROUND CHANGES. Body part/shoe Area (cm 2 )Force (N)Pressure (N/cm 2 ) 1 foot 2 feet 1 hand 2 hands

C ALCULATING PRESSURE Pressure (N/cm 2 ) = Force (N) b Area (cm 2 ) e.g. Pressure= force ÷ area = 700 ÷ 20 = 35 N/cm 2 ALWAYS 1.Formula 2.Add numbers 3.Answer 4.Units

W ATER PRESSURE  What is water pressure?  Which direction does it act in?  How does it change with depth?

S CUBA DIVING EXPERIMENTS    Polystyrene cup coffee-cup-2300-meters-depth-ocean Mythbusters

A IR PRESSURE  What is air pressure?  How does it change with altitude?  How can you increase air pressure?

D EMOS

MOMENTS  What is a moment?  Complete this formula: Moment ( ) =  What unit is a moment measured in?

WHY DID THIS HAPPEN?

B ALANCING LeftRight Distance from fulcrum (m) Mass (g)Weight (N) Moment (Nm) Distance from fulcrum (m) Mass (g)Weight (N) Moment (Nm)

C ONVERTING MASS TO WEIGHT Mass (kg) = mass (g) ÷ 1000 Weight (N) = mass (kg) ÷ 10

C ALCULATING THE MOMENT Moment (Nm) = Force (N) x distance (m) ALWAYS 1.Formula 2.Add numbers 3.Answer 4.Units

LEVERS  What is a lever?  Name 5 examples of where we use levers.

L ETS LOOK AT A BIKE AND SOME TOOLS

PLENARY Find the lever and fulcrum

Capsizing World speed sailing record Moth boat L´Hydroptere Sailrocket record (125km/h) Windsurf speed record