# Inertial Bounce Expression

This inertial bounce expression for Adobe After Effects will help your animations, like text, to bounce more organically, with will take out the robotic look of your motion graphics.

Just copy this text and paste the expression on the **stopwatch icon** on any parameter you want to apply. I usually use it for **position**, but it also works for** size** and **rotation**.

`amp = .1; freq = 2.0; decay = 2.0; n = 0; time_max = 4; if (numKeys > 0){ n = nearestKey(time).index; if (key(n).time > time){ n--; }} if (n == 0){ t = 0; }else{ t = time - key(n).time; } if (n > 0 && t < time_max){ v = velocityAtTime(key(n).time - thisComp.frameDuration/10); value + v*amp*Math.sin(freq*t*2*Math.PI)/Math.exp(decay*t); }else{value}`