| A | B |
|---|
| The sun is rising over the horizon. What is the reference point? | the horizon |
| A bus moving past people waiting on the sidewalk. What is the reference point? | people standing on the sidewalk |
| A passenger on a train sees a ball rolling down the aisle. What is the reference point? | the passenger |
| Two express subway trains traveling parallel to each other at the same speed whiz past people standing on a platform. What is the reference point? | people on the platfom |
| A passenger on one subway train looks at the window and sees another subway standing still. What is the reference point? | subway standing still |
| A person standing on a train platform sees a train pass by and then an airplane flying overhead at a faster speed. What is the reference point? | person standing on platform |
| A person on a plane looks down and sees a train moving backwards. What is the reference point? | person on the plane |
| You are reading a book on a plane. Why does it seem like the book isn't moving? | because the book and you have the same reference point |
