{{:physicsdemos:mechanics:motion_in_two_dimensions:simultanous_fall.jpg?600|}}
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Two steel balls are loaded onto a spring-loaded actuator which, when released, causes one of the balls to fall straight down and the other to fall with a noticeable horizontal velocity. The fact that they land simultaneously on the table or floor is made evident as the sounds of their respective impacts are heard in unison.

===Setup===

To set up: 

  - clamp base to table
  - get balls from cylinder that is attached to the rod that holds the spring gun
  - load gun and put sphere with hole on the back of the gun and ball with flat section on the platform at the front
  - when fired, the wall of the gun will cause the rod to escape the sphere, making the sphere fall freely down; at this same time the other ball will be ejected forward.

<WRAP tip>
Set the apparatus up over the metal plates in 106/120 so that the impact with the floor is loud enough for students to hear.

<nodisp>
This experiment is a good candidate for some AV setup love.  If we could easily setup a go-pro or something to replay the event that would be helpful for folks who aren't in the front.
</nodisp>
</WRAP>

PIRA DCS 1D60.20