Relative velocity - Kinematics in Two Dimensions

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Relative velocity

Lessons

Notes:

In this lesson, we will learn:

  • How to solve relative velocity problems in one dimension
  • How to solve relative velocity problems in two dimensions

Notes:

  • Frame of reference can be thought of as the point of view that measurements are made from.
  • A relative velocity is a velocity that is measured in a frame of reference. Usually, a moving object is the frame of reference.
    • Imagine you are on a train leaving a station at 10 m/s [E]. A bystander at the station would see the train move at 10 m/s [E]: this is the velocity of the train relative to the station ( vtraintostation\vec{v}_{train\,to\,station} ). The frame of reference is the station, since that is what the velocity is measured from.
    • If you imagine yourself looking out the window of the train it might appear that the station is moving 10 m/s [W], even though you know that it is the train that is moving. This is the velocity of the station relative to the train ( vtraintostation\vec{v}_{train\,to\,station} ) and the frame of reference is the train.
  • Intro Lesson
    Introduction to relative velocity
  • 2.
    Relative velocity in two dimensions
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Relative velocity

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