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# Chapter 9

## on Jan 31, 2008

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## Chapter 9Presentation Transcript

• What’s the Next Move?
• Can future events be predicted?
• Relative Velocity
• We will find out:
• That 2 objects will be on a collision course when their relative velocities points along a line joining them
• How to work this out
• Relative Velocity What happens when… A cricketer catches a ball? You see another plane out of your plane’s window? Will it hit us?
• Relative Velocity
• On a sheet of graph paper draw a plane in the top right hand corner…
• Draw a vector to represent 200m/s velocity
• Draw another plane at a random angle relative to the original plane (the are both aiming for the same corner of the paper)
• Label this with a vector of 200m/s too
Will they collide?
• Relative Velocity
• Subtract the velocity of one of the planes from each plane by drawing the same magnitude vector in the opposite direction
These will cancel out
• Relative Velocity
• Add the vectors ‘tip to tail’
• See if the resultant velocity hits your plane
• If it does, take evasive action!!!!!
•
• Exercises
• Use graph paper to complete questions on page 199