2D Motions, 1D Relative Motion, and 2D Relative Motion

For multidimensional motions, acceleration can affect both ___ and ___ of velocity

Direction, magnitude

Acceleration in the x direction ___ affect velocity in the y direction

Does not. Acceleration in the x and y directions are independent of one another

For 1D Relative Motion, what object is the reference frame?

The one that is moving

Equation for 1D Relative Motion (person on train example)

V_pg = V_pt + V_tg

where:

• V_pg is the passenger/objects velocity relative to the ground

• V_pt is the passenger/object’s velocity on the train/reference frame

• V_tg is the velocity of the train or reference frame

T/F Anything can be a reference frame

True! It is whatever object is moving

If the direction of a reference object changes, how would you show this in the equation?

Change the sign from pos to neg (or vice versa)

For 2D Relative Motion, what is the equation (plane example)

V_pg = V_pa + V_ag

where:

• V_pg is the velocity of the plane relative to the air (airspeed)

• V_pa is the velocity of the air relative to the ground

• V_ag is the velocity of the plane relative to the ground