Solution to Challenge 3

Running the contest
1. Fold the frog from a 10 cm by 15 cm rectangle, with the spring creased sharply.
2. Place it on a smooth table, press the back, and slide your finger off quickly. Measure from the start line to where the frog lands.
3. Do three jumps and write down each distance. Use the average, because single jumps vary a lot.

Changing one thing
Change only one variable at a time, otherwise you will not know which change mattered. Stiffer paper normally helps the most, because the Z-fold stores more energy. A sharper crease in the spring comes second. A longer back leg changes the launch angle and can help or hurt, so test it.

Example record (yours will differ)
Original: 38, 44, 41 cm, average 41 cm
Stiffer paper: 52, 49, 55 cm, average 52 cm

Checkpoint: you changed one thing, took three jumps each time, and compared averages rather than a single best jump.