Castlecomer Discovery Park is home to Ireland’s longest ziplines. How long is it? How fast is it? How do you slow down? Can I fall off? Why does weight matter? Why are some faster than others? What about the weather? At 308 metres long and 35 metres at its highest point, we reveal the science behind the Ireland’s longest zipline and the importance of STEM concepts such as velocity, mass, acceleration, gravity, friction, force and tension.