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| - | - What is the trajectory of a ball thrown straight up on the station platform, as seen by a train going through the station? | + | - This small group activity is designed to help upper division undergraduate students plot trajectories of objects undergoing linear acceleration in different reference frames. |
| - | - What if the train is accelerating? | + | - Students work in small groups and plot the trajectory of a ball thrown straight up as seen by a moving train undergoing constant speed and, separately, constant acceleration. |
| + | - The entire class wrap-up discussion reflects on the different plots students came up with, allowing students to compare trajectories of objects seen by observers in inertial and non-inertial frames. | ||
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