The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
From Kramer&Kramer Software:
Springs'nThings Lite - Version 1.5 Both Physics and FunSprings n Things is an entertaining demonstration application and educational display for the iPhone/iPad. It simulates the dynamics of up to four springs connected to a moveable ball. Touch, drag and release the ball to see it bounce around. The length and stiffness of the springs can be individually adjusted. One of the springs can be transformed into a fixed spring or a pendulum. The ball can be made to respond to the tilting and shaking motions of the iPhone/iPad. The motion of the ball can be perpetual or it can be slowed by spring resistance by viscous damping as if it were moving in air or water. Bounces forever0-4 springsAir, water or vacuum viscosityTurn gravity on or off - shake and tilt sensitiveReal computer simulation accurate to 1%Screen shots below:1) 4 springs2) a pendulum3) modify mass screen showing 3 springs4) modify springs screen showing a fixed spring5) full screen with a fixed spring and 3 additional springs