Relative Motion Problems

• handout graph paper

• Example ; Resolve the following Problem
  • A ship moves at a velocity of 10 km/h (E) relative to the water.
  • The water has a current of 3.0 km/h (S).
  • A mouse is walking 1.5 km/h (NW) on the deck of the ship.
  • What is the relative velocity of the mouse relative to the ground?

• Process and Concepts
  • Establishing variables
  • Creation of the vector equation.
  • Solve Graphically (scale on board 10 cm = 1 km/h)
    • must label vectors
    • must define scale
  • Solve analytically
    • Lesson - Components of a Vector
    • compare results

• For this course you are encouraged to use vector diagrams to scale for any problems even when supplemented with analytical analysis. If done with care the answer from such diagrams will be acceptable unless otherwise specified.

• for next year
  • relative velocity problem using student number.
  • example (bonus) with vector subtraction