In Belts & Gears, inhabitants of Mammoth Island are getting ready for their annual fair and are determined to make this year's event better than ever. Olive, a young islander, enlists the help of a visiting inventor to design exciting new rides, and together they decide that using belts and gears will help make the fair a success. While belts and gears don't increase the amount of force applied, they can transfer the force to change direction or speed.
In Levers, inhabitants of Mammoth Island have decided to enter their mammoth in a "heaviest mammoth" competition. To do so, they need to find the best method to weigh a mammoth. After observing some children playing on a see-saw, Olive, a young islander, is inspired to try a simple machine called a lever to get the job done. The Islanders then explore the properties of the three classes of levers and discover that scissors, nail clippers and tweezers are just a few examples of useful inventions based on the principle of the lever!
In Screws, inhabitants of Mammoth Island are in the process of building a new observation tower out of stone blocks when one of the islanders gets trapped at the top of the tower. With the help of a visiting gallant knight and his trusty mammoth, they are able to build a ramp around the circular structure and create a giant simple machine known as a screw. Turning the tower into a giant screw allows the islanders to spin the tower down into the soil, bringing the trapped inhabitant of Mammoth Island close to the ground -- and saving the day!
In Engines, inhabitants of Mammoth Island look for an alternative to mammoths to speed up pizza delivery. They decide to experiment with different engines and discover how each works -- from simple rockets to turbofan jet engines to gasoline engines. Comparing the advantages and drawbacks of these internal combustion engines, the islanders determine which one will serve their business best and ensure that their pizzas are delivered on time.
