LEGO EV3 User Manual

4. Hungry Alligator Teacher Notes
Students will build and program a mechanical alligator that makes sounds and is motorized to
open and close its jaw.

Objectives

Science
Trace the transmission of motion and transfer of energy through the machine.
Identify the pulleys and belts and the slowing down mechanism at work in the model.
Consider the needs of living animals.
Technology
Create a programmable model to demonstrate the knowledge and operation of digital tools and
technological systems.
Engineering
Build and test the alligator's movement.
Improve the alligator's behavior by adding the motion sensor and programming sounds to
coordinate with the movement.
Mathematics
Understand how the distance between an object and the motion sensor is important to how the
sensor functions.
Understand and use numbers to represent the type of sounds played and the amount of time the
motor turns on.
Language
Prepare and deliver a demonstration about alligators using the alligator model.
Use technology to create and communicate ideas.
Communicate in spoken or written forms using the appropriate vocabulary.
Vocabulary
Belts, motion sensor, and pulley. Blocks: Motion Sensor Input, Motor On For, Motor This Way, Motor
That Way, Number Input, Play Sound, Repeat, Start On Key Press and Wait For.
Other Materials
Optional for Extension: Construction paper, cardboard, grass, rocks.
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