The wheel breaks on the CyberSquad's scooter, and they need to replace it in order to stop Hacker. They decide to shape one of the stones on the ground into a wheel. Their first attempt fails because the wheel is not round. After more thinking about circles, they figure out how to create a proper wheel.
Sophie illustrates the six basic simple machines that exist and explains how they are useful in our everyday lives. She defines force and work and mentions that simple machines reduce the amount of work required for a task.