relative motion 

Summary

Motion depends on who is watching an object can seem still to one observer and moving to another in relative motion problems velocities are added as vectors to find how fast something is moving relative to the ground or another object even though the formula looks simple the directions matter so vector addition must be used

• Motion depends on frame of reference

• Ground = reference frame

• Medium = air, water, conveyor belt, etc

Formula

• V(object/ground) = v(object/medium) + v(medium/ground)

• Velocities are vectors

• Must use vector addition not normal addition