WAVES
How does sound move?
Sound travels as vibrations through a medium such as air, water, or a solid. Pitch and loudness describe different features of the sound wave.
Physics & Technology
Every device is a pile of physical ideas.
Forces, waves, circuits, and materials explain how ordinary objects work. Engineers use those ideas to design tools, test prototypes, and solve specific problems.
Build an explanation
A circuit is a path for electrical energy.
A simple circuit needs a source, a complete conducting path, and a device that transfers energy into another form, such as light or motion. If the path is broken, the circuit stops working. Real devices include more parts and controls, but the basic idea is a useful place to begin.
Technology also depends on materials. A material’s flexibility, strength, conductivity, and response to heat can make it useful for one job and unsuitable for another.
Physics in action
Make the invisible easier to see.
These ideas show up in games, music, phones, transportation, and the built world.
MATERIALS
Why do some materials bend while others snap?
A material’s structure affects how it responds to a force. Engineers test samples to understand strength, flexibility, and failure points.
ENGINEERING
How do sensors help robots respond?
Sensors collect information about a robot’s surroundings. A controller uses that information to trigger an action, creating a loop of sensing and response.
For hands-on building, use low-voltage classroom kits and follow the kit instructions. Do not connect homemade circuits to wall outlets.