For the first part of our experiment, we wanted to know how fast the BBs are traveling when shot. This would help us establish their momentum. (Momentum is velocity x mass.)
We thought of several ways we could test for the speed.
- We could shoot the BB through two laser beams.
- We could shoot the BB straight into the air and time how long it takes to land.
- We could shoot a BB at a mobile police radar unit that warns drivers of their speed.
We used a program called Audacity to measure the time difference between the sound of the gun firing and the sound of the BB hitting the fence. It was 0.07 seconds.
There are 5280 feet in a mile, so it would take a BB ((5280 / 10) * 0.07 = ) 36.96 seconds to go a mile. To get miles per house we take 60 seconds/minute * 60 mintues/hour = 3600, and divide that by 36.96 seconds. The total (3600 / 36.96) is 97.4 miles/hour.
A BB is 5.23 grains, which is .01 ounces.
Next, we pinched a row of Cheetos between two kabob skewers.