What is motion

The sun rises over the horizon

Background

A person standing near a railroad track sees a train pass by, then notices an airplane fly overhead in the same direction as the train, but at a much faster speed

Compare

A bus moves past people standing on a sidewalk

Moving

Two express subway trains traveling at the same speed on parallel tracks whiz past passengers waiting on the platform of a local station

Moving

A passenger in the airplane looks down and sees the tree moving backward

Object

A passenger on a train sees a ball roll down the isle

Object

A passenger on one of the subway trains looks out the window and sees another train standing still

Stationary

Use the following to write a definition of frame of reference. Background Object Moving Stationary Object Compare

The background object that seems to be stationary or not moving , this object is used to be compared when motion is described.

What is motion

Whenever you describe something that is moving, you are comparing it to something that is assumed to be stationary, or not moving.