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Science lesson plan · 1st grade (Year 2 in England) · 60 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 · 6 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. Your shadow always points away from… (the light source / your friends / the ground / the nearest tree) → the light sourcePrompt: Where is the light coming from?
  2. True or false? You can make a shadow without any light. (True / False) → FalsePrompt: What does an object do to light to make a shadow?
  3. Shadows: which statement is true? (Shadows point towards the light. / A shadow shows your face and your eyes. / The shadow of a cup has the shape of a triangle. / Your shadow moves when you move.) → Your shadow moves when you move.Prompt: Picture a torch, a toy and a wall.

Hook · 6 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 · 12 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 · 12 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? (around midday / just before sunset / it is always the same length / just after sunrise) → around middayPrompt: When is the Sun highest in the sky?
  2. True or false? Moving an object towards a lamp makes its shadow grow. (True / False) → TruePrompt: Picture a puppet near the lamp and then near the screen.

You do: independent practice · 17 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 8 questions are on the student sheet below, with answers in the key.

Exit ticket · 7 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? (Paint the puppet black. / Move the puppet closer to the screen. / Turn the light off. / Move the puppet closer to the light.) → 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? An object always makes a shadow the same size, wherever the light is. (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

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Make a shadow bigger or smaller

Name

Date

Score/ 8

  1. Question 1

    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 torch010203040506070808010 cm7020 cm5830 cm4740 cm

    Answercm

  2. Question 2

    True or false? Shadows are longest at midday.

    • A. True
    • B. False

  3. Question 3

    How can you make a shadow SMALLER and sharper?

    • A. Use a bigger object.
    • B. Shake the object.
    • C. Move the object closer to the screen, away from the light.
    • D. Move the object right next to the light.

  4. Question 4

    True or false? Moving a puppet away from the light makes its shadow bigger.

    • A. True
    • B. False

  5. Question 5

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

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

  6. Question 6

    True or false? Shadows change length during a sunny day.

    • A. True
    • B. False

  7. Question 7

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

    Shadow height (cm) for each distance from the torch01020304050606010 cm4920 cm3430 cm2140 cm
    • A. 10 cm
    • B. 20 cm
    • C. 30 cm
    • D. 40 cm

  8. Question 8

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

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

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Answer key: Make a shadow bigger or smaller

  1. 1. 33 cm

  2. 2. B. False

  3. 3. C. Move the object closer to the screen, away from the light.

  4. 4. B. False

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

  6. 6. A. True

  7. 7. D. 40 cm

  8. 8. D. around midday