Relative Motion

In tuesday's class we learnt how to calculate problems that involve relative motion. Relative motion is when an object is moving compared to some frame of reference which is also in motion. We then watched videos on some examples such as ducks in the wind and an endless pool.

We then did some examples.

Plane is travelling 200km/h in the air. Wind is blowing 50km/h towards the west. Determine the velocity of the plane in terms of the ground if the plane moves west.

    pVa= pVa + aVg
          = 200.km/h [W] + 50. km/h[W]
          = 250 km/h[W]

If the distances being added are not collinear we would solve them like the vectors we have been doing for the past couple days. We would draw a diagram, solve for the missing side, then solve for the missing angle.





Casey is next.