My son has to do a science project for 6th grade. We are thinking about dropping weighted ping pong balls from about a 6 six story height. We would measure how fast each ball fell. (air resistance would cause the lighter balls to fall slower).
Any ideas on how we could time the ball drop?
I am thinking about using two arduinos. One would be at the top. The ball would fall through a tube and I would use a photo sensor to detect when the ball dropped. The top arduino would then fire a laser pointer to signal the bottom arduino to start a timer clock. The bottom arduino would have an accelerometer attached to a table. When the ball lands on the table, the accelerometer senses the impact and stops the clock. I then have the start/stop time sent back to my laptop.
Anyone think this would work or have a better idea? Would an accelerometer be able to sense this type of thing?