Maryland Grade 1 Science

Connect a sound with a moving source

Observe a teacher-controlled ruler, explain sound and vibration with a simple model, and explore Maryland Grade 1 science lessons and references.

The Maryland science directory (archived state copy) links the Next Generation Science Standards publisher. The state standards catalog identifies the 2013 NGSS framework. The Publisher’s September 2017 DCI arrangement of the 2013 Next Generation Science Standards supplies the selected expectation and its practices, core ideas, crosscutting concepts, clarifications, and boundaries. Its September 2017 arrangement date is not a new Maryland adoption. The live MSDE site displayed a maintenance notice during review and linked an archived backup; working archived state references are labeled here. Check the school’s course plan and MSDE updates for later changes. This activity selects a Grade 1 expectation. It is one part of a science course, not a complete curriculum.

What changes when the ruler stops vibrating?

A teacher holds one end of a plastic ruler firmly on a desk, with the other end extending a short distance beyond the edge. After a gentle pluck, the free end moves back and forth and a sound is heard. When the teacher stops its movement, the sound stops. The table gives an illustrative observation record, not measurements from a Maryland classroom. Ask the child to draw the moving end and tell what changed between the two observations. Use the teacher’s chosen equipment and classroom procedures.

Explain the evidence or model

The moving end vibrates: it travels back and forth around its resting position. The sound is heard while that motion continues. When the teacher holds the end still, the ruler no longer produces that continuing sound. This supports the connection between a vibrating object and sound. It does not mean every visible movement makes a sound loud enough to hear. A child can mark several positions of the end in a drawing and use arrows to show the repeated movement. One arrow pointing away from the desk would suggest a single trip rather than vibration. Let the child describe the pattern in familiar words before introducing the term.

What to check in the explanation

Check whether the child connects the observations rather than simply repeating that sound means vibration. Ask which part moved and how they know. The comparison changes the ruler’s motion while keeping the same ruler and desk. It is a beginning investigation, not a measurement of sound frequency or a complete proof about all sources. Looking for a moving object is also insufficient for the other part of the expectation: sound can make materials vibrate. That direction requires a further observation. Do not draw sound as little pieces of the ruler traveling to the listener.

Plan the next activity

1. Draw the ruler in its resting position and its observed moving positions.
2. Describe what was different when the teacher held it still.
3. Use the drawing and observation record to explain the sound.

For a follow-up, use a teacher-selected demonstration in which sound from a speaker makes a light material move. Compare the observation with the ruler: first a vibrating source produced sound, then sound caused another material to vibrate. The teacher should choose the arrangement and confirm that airflow or direct touching is not being mistaken for the effect of sound. Have the child add a second drawing and explain which material moved. This activity begins work on the selected expectation; both directions and further evidence belong in classroom instruction.