A DIY physics challenge
The answer : 61
Any smartphone can, within a few minutes, measure an angle, light, sound, an acceleration, magnetic field… But can you measure the height of a building with your smartphone?
On this website, you will find 61 methods to do so, but there are surely many others! Are you a physics fan? Student? Teacher? Parent? Child? Science Museum? Association? Here is a simple example to start, then small selected challenges targeted according to your tastes and your level (beginner, math, tinkerer…). Everything is downloadable and freely and easily usable.
Will you face the challenge?