Poppy Tower Ride: Graphs
![](fileadmin/_processed_/0/7/csm_poppy_towers_5pt_f341c65573.jpg)
Forces in the Poppy Tower
The graph above shows data collected with an iPhone 11, using the app PhyPhox during the teacher day on 9 October 2019. The total force was obtained by calculating the vector sum of the forces along the three axes, i.e. N/m= (ax+ ay + az)1/2, which works well, since there are no negative G-forces in the Poppy Towers.
The graph below shows two bumps in more detail.
![](fileadmin/_processed_/a/6/csm_poppy_detalj_5pt_9ca50b59c9.jpg)
Look at the graph of the forces during two bumps. At the beginning of the graph you are essentially at rest in the highest point. Consider the following questions.
- At what time is the acceleration largest?
- When do you move the fastest on the way up?
- When do you move the fastest on the way down?
- At what time do you feel the heaviest?
- At what time do you feel the heaviest?
- Could you draw an approximate graph of the velocity during these bumps?
Read more about force, velocity and elevation in Familien Free Fall Towers in a recent paper.