I bet I can cross the room without having the lights come on. Class members set up an experiment in which they try to determine what materials will mask motion detected by a sensor. Groups predict how materials will interact with light, heat, and sound. They then test their predictions by using an IR sensor and/or an ultrasonic sensor.

Concepts

motion, motion detectors, infrared light, reflections, sound waves, the doppler effect, technology resources

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Instructional Ideas

• Provide instruction on how energy reacts with materials
• Research stealth technology and why the designs are the way they are

Classroom Considerations

• Requires motion sensors and several types of materials

Pros

• Includes pre-, during-, and post-activity assessment suggestions
• PowerPoint presentation provides the directions for the class to tackle the problem

Cons

• Ultrasonic sensors are expensive and may not be feasible to purchase