Always believe in the laws of physics

Yesterday on Facebook someone posted a picture of a hammer “floating” on the edge of the table with the help of a ruler. One of the comments was “It is possible only theoretically, the picture is a photoshop. I decided to check and prove that physics always works. Here is a picture (not a great angle, but you can get the idea).


Only one inch of the ruler is on the table, but it is enough for the system to stay at equilibrium. You can try it at home, it takes 30 seconds to set up. It is a perfect illustration of a static equilibrium, even better than a bird made of a potato, two forks, and a toothpick. Next year I will give my classes a lab problem to find a position of the center of masses of this system.

Can you recommend your favorite experiments?


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