Teaching Physics with the Physics Suite Edward F. Redish

Force graphs*

 A cart can move to the right or left along a horizontal track (the positive part of the x axis) as shown in the figure below. Assume that friction is small enough that it can be ignored. A force is applied to the cart. Choose the one force graph (A through H) for each statement below which would allow the described motion of the car to continue.
You may use a choice more than once or not at all. If you think that none of the graphs represents the correct answer, choose J.
1. The cart moves toward the right (away from the origin) with a steady velocity.
2. The cart moves toward the right and is speeding up at a steady rate (constant acceleration).
3. The cart moves toward the left (toward the origin) with a steady (constant) velocity.
4. The car moves toward the right and is slowing down at a steady rate (constant acceleration).
5. The cart moves toward the right, speeds up and then slows down.
6. The cart moves toward the left and is speeding up at a steady rate (constant acceleration).

* From the FMCE by Thornton and Sokoloff.

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