Finding the acceleration of gravity with the phone Name This Lab uses your phone (or an ipad) and an App called Phyphox. Introduction In this activity you will measure the acceleration of gravity \"g\" with an App on the phone. If you do not have a smartphone, maybe you may borrow one from a friend or a family member. If you have trouble finding a smartphone to use, please let your instructor know and they will find a solution. Video description of the App and how to use it. Activity 1. Download the App Phyphox on your phone. The app has been created by the Institute of physics at the Aachen University in Germany. 2. Open the App and select the experiment Acceleration (without g). Note from the App developer > 3. Select the tab "Absolute" acceleration. 4. Click play, and drop the phone from a certain height. Around 20 cm is good. Be careful to drop it on a soft surface like a bed, a pillow, or a sweater! 5. Stop the data collection. 6. Use the "Pan and zoom" tool on the bottom of the screen to zoom the image. Find the interval of time of free fall where your data are about alligned on a flat horizontal line. Please see the image below. ollision with the soft surface Free fall region 7. Use the "Pick data" tool on the bottom of the screen to select one data in the free fall region. Report it on the table below. Be mindful of significant digits. 8. Repeat the experiment 10 times. 9. For each trial, take a screenshot of your phone screen showing the data-point you selected. Report all ten screenshots here. (0.5 pt each screenshot, 5pts total) [Screenshots] 10. Complete the table below (10pts) Trial Acceleration of gravity \"g\" m/s? 1 2 3 11. Take the average of the 10 values. This is your experimental value of the acceleration of gravity with its uncertainty. Write here, please, your average and include the units. (1pt) [Answer] 12. To have an idea of how accurate your measurement is, find the percent error with the actual value of the acceleration of gravity using the formula below. experimental average "g" - actual "g' Y%error = 100 * actual "g" Write here, your percent error. (2pts) [Answer, show your work with the numbers] 13. In the chapter about universal force of gravitational attraction, you learned that the attractive force between two masses m7 and m2 at the distance d one from the other is equal to mim2 - 2 Tr May you please write a sentence explaining what is the difference between "little g" and "big G" ? (2pts) [Answer]