Having my physics students build mousetrap powered cars. These are crude, but they work. "Races" tomorrow.
Testing the cars: I liked this photo. I had the camera on the floor on self timer mode. The car is invisible due to the shutter speed. All you can make out is the pencil which is the drive axle on this car.
So...the big "race" is tomorrow and the whole school is invited to watch. Who will win the Big Cheese Trophy?