Description: This demonstration illustrates how a ball shot out horizontally and a ball dropped with zero initial velocity will hit the ground at the same time, because they both experience the same vertical acceleration.
- Two ball drop apparatus (see photo)
- Both ball bearings for the apparatus (one has a hole through it)
- Table clamp
- 7- or 8-foot metal pole (there are some over 7 feet long up by the singing rods).
- Clamp the pole to a table
- Use the s-clamp to attach the two ball drop apparatus to the pole.
- Once in the classroom, raise the apparatus and pole up as high as possible for the greatest effect.
- Make sure to provide a stool or a step-ladder for the professor to get up on to load and release the device (or, you may need to come in and run the demonstration for the professor).
- Pull back the spring mechanism and lock it into place.
- Place the ball bearing with the hole on the end of the rod that sticks out beyond the iron base.
- Set the ball bearing with no hole on the OUTTER divot, near the edge of the iron base.
- To release, lift up on the release lever. You should be able to hear both balls hit the ground at the same time.