Notice that there is a different coefficient for static and kinetic (sliding) friction. On to the first experiment (using the DIY force scale). Here I have a block on a table.

However, the acceleration is a little bit different. This has an acceleration of 1.07 m/s 2. For this second friction experiment, the cart started with a speed of about 5.4 m/s.

How can a horde of active robots be automatically brought to a standstill? By arresting their dynamics in a self-sustained way. This phenomenon was discovered by physicists at Heinrich Heine ...