8th Grade Science Guide

8.2: Physics 3 Dimensions & Progressions

Unit 1

STANDARD ● 8.2.6 Obtain and evaluate information to communicate the claim that the structure of digital signals are a more reliable way to store or transmit information than analog signals. Emphasize the basic understanding that waves can be used for communication purposes. Examples could include using vinyl record vs. digital song fles, flm cameras vs. digital cameras, or alcohol thermometers vs. digital thermometers. (MS-PS4-3)

CONCEPTS

SKILLS

● Structure of digital signals ● Reliable way to store and transmit information ● Analog signals

● Obtain and evaluate information ● Communicate a claim

LEARNING PROGRESSIONS

● Digitized signals are sent as wave pulses ● Digitized signals are a more reliable way to encode and transmit information.

VOCABULARY

● Computer ● Machine ● Electricity ● Device

● Conversion ● Convert ● Transfer ● Wave

● Transmission ● RadioWave ● Digital Signal ● Analog Signal

POSSIBLE PHENOMENA ● A vinyl record has better sound quality than a CD or an MP3, however it can be easily scratched when an MP3 on an electronic device cannot. ● In 1977, NASA recorded many sounds from Earth on a record that was sent into space on the Voyager spacecraft. ● Analog television signals can be viewed, but may be fuzzy. Digital television signals are perfectly clear or not seen at all. ● My phone can store thousands of songs, a CD can store about 100 songs, and a vinyl record can store about 12 songs. END OF UNIT COMPETENCY WITH LANGUAGE SUPPORTS ● I can provide evidence for a claim that digital signals are more reliable for storing and transmitting information than analog signals. ○ Language Supports: ■ Abstract nouns to introduce concepts (effect, relationship)

■ Connectors to link clauses (as a result of, therefore, instead, however, on the other hand) ■ Clause types to express causality (if/then) ■ Connectors to signal time (therefore, consequently, as a result of, because)