Ally and Ben are standing at opposite ends of a field. They need a device to communicate with each other. Which device is designed for this purpose?

• Bucket

• Straw

• Megaphone

Tony and Juan want to design a device so they can talk to each other from across the classroom. Which tools should they use to build their device?

• Paper cups and string

• Light bulbs and batteries

• Plastic bottles and water

Charlie designs three devices that produce sound using different materials. He wants to use one device to warn people of danger at a beach. How can Charlie evaluate which device works best for warning people? Circle TWO correct answers.

• Weigh each device and use the lightest device.

• Test each device to see which produces the loudest sound.

• Ask people at the beach to choose the device that looks best.

• Test each device at the beach to see how far the sound can be heard.

Rico needs to get his friend’s attention from across the street. He thinks about how some birds communicate by tapping on trees. Rico uses the same strategy and builds a device to model the sound the birds make. Which instrument did he make?

• Spoon

• Whistle

• Block with mallet

• Drum

The bird uses a stick to hit a tree. It uses sound to find other birds. Alexa wants to design a device that works the same way. Identify which materials will work best. Circle TWO correct answers.

• Soup can

• Rubber bands

• Stick

• Paper

Raquel and Meg design a device by putting four paper tubes together. They talk into the ends of the tubes. The sound goes through the tubes, but then the tubes come apart. Which solutions will address this problem? Circle TWO correct answers.

• Gluing the tubes together

• Adding more tubes together

• Taping where the tubes come together

• Punching holes into the sides of the tubes