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Lesson

Light, Sound, and Heat

Explain seeing and shadows, sound vibrations, and the three main ways heat is transferred.

30min lesson

Objectives3 goals Lesson6 blocks Review11 assets Practice40 items

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Explain shadows, reflection, and refraction using everyday examples.
Connect sound and pitch to vibrations.
Distinguish conduction, convection, and radiation.

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Concept

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Light lets us see. A lamp sends out light; an ordinary book reflects some light into our eyes. In uniform air, light travels in straight paths at this level of study. An opaque object blocks light and can make a shadow on a surface behind it. Transparent materials let us see clearly through them; translucent materials scatter light and blur the view. Reflection is light bouncing back from a surface, as at a mirror. Refraction is a change in light's direction when it passes at an angle between materials such as air and water. A straw can look bent at the water surface even though it is straight. Sound begins with vibrations. A vibrating source makes nearby particles vibrate, carrying sound through air, water, or solids. Sound cannot travel through a vacuum, where there are no particles to carry it. Frequency means vibrations per second: higher frequency gives higher pitch. Loudness is different from pitch. Heat is energy transferred because of a temperature difference. It flows from hotter to cooler regions. Conduction transfers energy through matter without the material flowing from place to place. Convection transfers energy with moving liquid or gas. Radiation transfers energy by electromagnetic waves and can cross empty space, as sunlight does.

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Light, Sound, and Heat

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Light, Sound, and Heat

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Force, Energy, and Simple Machines

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