If a turtle and beetle fall from the same height, which would sustain more injury? Assume that both the turtle and beetle are geometrically similar. The amount of force of which the creatures reach the ground would be the measured parameter, right? So, including air resistance in the equation, how would one determine how much force the creatures reach the ground? F = ma, i.e. the amount of injury would depend on the creatures' mass alone (assuming that biological issues are neglected)? What if the creatures have reached their terminal velocity before reaching the ground, i.e. they are not accelerated; F = m(0) = 0?