Kentucky Grade 1 Science

Compare what happens when different materials enter a light beam

Plan a fair comparison of clear plastic, wax paper, and cardboard in a light beam, describe observations, and use current Kentucky Grade 1 science references.

The Kentucky science standards directory directs readers to the current Kentucky Academic Standards. The science document used here is the December 2022 edition. Use the Kentucky Academic Standards for Science, December 2022 for the selected performance expectation and its complete supporting information. This activity selects a Grade 1 expectation. It is one part of a science course, not a complete curriculum.

What changes on the screen behind a material?

A teacher aims a classroom flashlight at a white screen and marks the positions of the light, material holder, and screen. Children compare an empty holder with clear plastic, wax paper, and cardboard. The record below is an invented illustration of possible observations, not a claim that the class has already carried out the investigation. Actual results depend on the particular pieces and setup.

Explain the evidence or model

The empty holder gives a starting view. The clear plastic allows a bright patch to remain visible behind it. Wax paper allows some light through but spreads it, producing a less sharply defined patch. Cardboard blocks the direct beam and creates a darker area behind it. Children describe what they see before choosing a label. The comparison concerns the effect of placing a material in the light’s path; the flashlight has not been turned off when the cardboard is inserted. Some light can still reach other places in the room. A shadow does not require the whole room to become completely dark.

What to check in the explanation

Keep the flashlight setting and the marked distances the same while changing the material. A comparison is harder to interpret if the flashlight is also moved or its brightness changes. Ask children whether light reaches the screen and what the patch looks like, rather than demanding a memorized vocabulary word first. Pieces of plastic can be tinted or cloudy, so do not assume every object with the same material name produces the same observation. The teacher manages the light source and positions it toward the screen. Students can draw the observations and explain them orally without calculating the speed of light, which lies outside this expectation’s assessment boundary.

Plan the next activity

1. Predict what the screen will look like with each teacher-selected piece.
2. Change one piece while keeping the marked setup steady.
3. Draw the screen observation and explain what changed.

Repeat a selected comparison and see whether the observation is similar. If it differs, inspect the setup and the piece before changing the explanation. For transfer, ask what might happen with a partly covered holder, then use an appropriate teacher-led demonstration. This develops a question from the evidence rather than treating the illustrative record as an answer to copy. Kentucky’s Grade 1 expectation includes planning and conducting a collaborative investigation. The short worked record helps prepare for that work but cannot replace children’s observations. Read the complete standard and local curriculum when choosing additional materials or later light investigations.