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Science lesson plan · 1st grade (Year 2 in England) · 30 minutes

Make a shadow bigger or smaller

Light, sound and waves

CCSS NGSS.1-PS4-3England: KS2 Y3 Light

Objective and success criteria

Students will: Make a shadow bigger or smaller.

  • I can answer questions on today's skill on my own, without help.
  • I can explain each step and say why it works.
  • I can check my answer and spot a mistake.

Before and after

Needs first: How shadows form when light is blocked

Leads to: the next skill in this area.

Materials: Slinky or rope, Mirrors and torches, Mini whiteboards, A diagram or short video clip of the idea, Printed student sheet (below).

Warm-up · 4 min

  • Quick retrieval from earlier learning (How shadows form when light is blocked). Students answer on mini whiteboards.
  • Show answers together and note who needs support in the main task.
  1. Why is the shape of a shadow the same outline as the object? (Light bends around the object. / The object paints its shape. / Shadows are photos of the object. / Light travels in straight lines, so it is blocked exactly where the object is.) → Light travels in straight lines, so it is blocked exactly where the object is.Prompt: Does light curve round corners?
  2. True or false? A red ball makes a red shadow. (True / False) → FalsePrompt: What does an object do to light to make a shadow?
  3. Shadows: which statement is true? (A shadow shows your face and your eyes. / The shadow of a cup has the shape of a triangle. / Shadows point towards the light. / A tree's shadow on the grass is in a different place in the morning and the evening.) → A tree's shadow on the grass is in a different place in the morning and the evening.Prompt: Picture a torch, a toy and a wall.

Hook · 3 min

  • Ask the class to make a wave with a rope or slinky and describe what moves and what doesn't.
  • Share the objective: Make a shadow bigger or smaller. Read the success criteria together.

I do: model it · 7 min

  • Work through the example out loud, saying why you do each step, not just what you do.
  • Example: In a shadow puppet show, how can you make the puppet's shadow BIGGER on the screen?
  • Step 1: Closer to the light → bigger shadow.
  • Step 2: So the answer is: Move the puppet closer to the light.
  • Answer: Move the puppet closer to the light.
  • Pause after each step and ask a student to say what comes next.

We do: guided practice · 6 min

  • Do these together. Students try each step on whiteboards before you reveal it.
  • Use the hints as prompts rather than giving the answer.
  1. At what time of a sunny day is your shadow shortest? (it is always the same length / around midday / just after sunrise / just before sunset) → around middayPrompt: When is the Sun highest in the sky?
  2. True or false? Moving a puppet away from the light makes its shadow bigger. (True / False) → FalsePrompt: Picture a puppet near the lamp and then near the screen.

You do: independent practice · 7 min

  • Students work on the student sheet. Circulate and check the first two answers of every student early.
  • Students who finish: write a question of their own for a partner, with the answer.

The 6 questions are on the student sheet below, with answers in the key.

Exit ticket · 3 min

  • Two questions on their own. Sort answers into got it / nearly / not yet to plan the next lesson.
  1. In a shadow puppet show, how can you make the puppet's shadow BIGGER on the screen? (Move the puppet closer to the screen. / Paint the puppet black. / Move the puppet closer to the light. / Turn the light off.) → Move the puppet closer to the light.Prompt: When the puppet is near the lamp, it blocks a wider spread of light.
  2. True or false? Moving a puppet away from the light makes its shadow bigger. (True / False) → FalsePrompt: Picture a puppet near the lamp and then near the screen.

Watch out for

  • Everyday meanings of words getting in the way of the science meaning: define key words explicitly.
  • Remembering facts without the reason: ask "why?" and "what is the evidence?"

Support and stretch

Support

  • Review first: How shadows form when light is blocked.
  • Use concrete materials: slinky or rope.
  • Give the first step of each question, or a partly worked example to finish.
  • Pair with a confident partner for the guided practice.

Stretch

  • Explain a common mistake in writing and how to fix it.
  • Write a word problem that uses today's skill, then solve a partner's.

Homework and more practice

Free online practice with hints and printable worksheets for this skill: eurekami.com/science/grade-1.

Free lesson plan from eurekami.com/lesson-plan-builder

eurekami

Make a shadow bigger or smaller

Name

Date

Score/ 6

  1. Question 1

    True or false? Shadows are longest at midday.

    • A. True
    • B. False

  2. Question 2

    Noah moved a toy away from a torch (flashlight) and measured its shadow on the wall. How much taller was the shadow at 10 cm than at 40 cm?

    Shadow height (cm) for each distance from the torch010203040506070807610 cm6520 cm5630 cm3740 cm

    Answercm

  3. Question 3

    At what time of a sunny day is your shadow shortest?

    • A. around midday
    • B. just after sunrise
    • C. just before sunset
    • D. it is always the same length

  4. Question 4

    True or false? An object always makes a shadow the same size, wherever the light is.

    • A. True
    • B. False

  5. Question 5

    Noah moved a toy away from a torch (flashlight). At which distance was the shadow tallest?

    Shadow height (cm) for each distance from the torch010203040506070807210 cm6120 cm4830 cm3640 cm
    • A. 10 cm
    • B. 20 cm
    • C. 30 cm
    • D. 40 cm

  6. Question 6

    In a shadow puppet show, how can you make the puppet's shadow BIGGER on the screen?

    • A. Turn the light off.
    • B. Paint the puppet black.
    • C. Move the puppet closer to the light.
    • D. Move the puppet closer to the screen.

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Answer key: Make a shadow bigger or smaller

  1. 1. B. False

  2. 2. 39 cm

  3. 3. A. around midday

  4. 4. B. False

  5. 5. A. 10 cm

  6. 6. C. Move the puppet closer to the light.