EES 108 Class 18

# EES 108 Class 18 - Pressure Pressure • Pressure = weight...

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Pressure

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Pressure • Pressure = weight of air overhead More air overhead = more pressure
Pressure • Pressure = weight of air overhead More air overhead = more pressure

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Surface Pressure vs. Sea-Level Pressure • Don’t worry about numbers for correction: We won’t calculate pressure corrections Meteorologists look them up in a table
Force and Motion • Newton: If there is no force: • An object at rest remains at rest • A moving object keeps moving – at the same speed, – in the same direction If there is force: • Acceleration – Change of speed (speed up or slow down) – Or change of direction – Or both

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What this means • Forces acting on parcels of air create wind Pressure Gravity Coriolis force Friction • If forces balance: Steady speed, constant direction • Forces not balanced: Change in speed Change in direction Or both • The only way winds can start is unbalanced force!
Adding forces • Vector: arrow Direction = direction of force Length = strength (magnitude) of force Add: place head to tail

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Force and acceleration • Force points in same direction as velocity: Speeds up • Force points in opposite direction: Slows down
• Force at right angles to velocity: Turns without changing speed

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EES 108 Class 18 - Pressure Pressure • Pressure = weight...

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