EES 108 Class 18

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

Info iconThis preview shows pages 1–10. Sign up to view the full content.

View Full Document Right Arrow Icon
Pressure
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Pressure • Pressure = weight of air overhead More air overhead = more pressure
Background image of page 2
Pressure • Pressure = weight of air overhead More air overhead = more pressure
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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
Background image of page 4
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
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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!
Background image of page 6
Adding forces • Vector: arrow Direction = direction of force Length = strength (magnitude) of force Add: place head to tail
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Force and acceleration • Force points in same direction as velocity: Speeds up • Force points in opposite direction: Slows down
Background image of page 8
• Force at right angles to velocity: Turns without changing speed
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 10
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 28

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

This preview shows document pages 1 - 10. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online