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Chapter 9
 

Chapter 9

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    Chapter 9 Chapter 9 Presentation 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
      • How to add vectors by adding ‘tip to tail’
    • 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
      • Answer question sheets