Drawing 2D Velocity Structures?

[justinh8]

Drawing 2D Velocity Structures?

Homework Statement

I need some help in drawing structures such as velocity of the plane relative to the air, velocity of the plane relative to the ground, and velocity of the air relative to the ground. Please give me some tips on how to drawing these, thanks!

 

[tiny-tim]

hijustinh8!

usually, you're given two out of the three velocities, and you're asked to find the third…

drawing the two given velocities is easy (mark them with arrows), the only difficulty is knowing whether to fit one onto the beginning or the end of the other!

to get that right , give them names like V_AP V_AG and V_PG …

then all you have to remember is that the arrows must agree with the vector equation AG = AP + PG

see also the pf library on vector triangle