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Relative Velocities

Highland Secondary School. Relative Velocities. Frame of reference. A set of coordinates used to measure the velocity of an object. When adding vectors, always add tip to tail. The general equation for relative ve- locity vectors is. Highland Secondary School.

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Relative Velocities

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  1. Highland Secondary School Relative Velocities Frame of reference A set of coordinates used to measure the velocity of an object When adding vectors, always add tip to tail. The general equation for relative ve- locity vectors is

  2. Highland Secondary School Velocity of the object relative to the ground Velocity of the object relative to the ground Velocity of the object relative to the medium Velocity of the medium relative to the ground Typical Objects: footballs, airplanes, ships, swimmers, newspapers Typical Media: quarterbacks, air, water, newspaper delivery personnel

  3. Highland Secondary School Examples: 1. Iggy is swimming across the St. Lawrence River, where the current is 2 m/s [E]. He is able to swim with a speed of 3 m/s in still water. a) What must his heading be in order to progress directly across to the other side (North)? What is his velocity relative to the ground in this case? b) If his heading is directly North, what will his velocity be relative to the ground and how far down river does he end up?

  4. Highland Secondary School Therefore heading is [N 42º W].

  5. Highland Secondary School b)

  6. Highland Secondary School 2. Selma is flying her Sopwith Camel with a velocity of 120 m/s [NE] relative to the ground. The air speed of the plane is 85 m/s and its heading is [W30ºN]. What is the wind speed and direction? Using components:

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  8. Highland Secondary School

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