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      Lesson details

      Learning outcome

      I can produce an exploded diagram to show different parts.

      Key learning points

      1. Exploded diagrams visually separate the parts of an object while maintaining their relative positions.
      2. Effective exploded diagrams include a centre line for alignment, equal spacing between parts and clear labeling.
      3. Exploded diagrams can be shown vertically or horizontally.

      Keywords

      • Exploded diagram - shows all parts of an object separated in the correct places along an axis or plane

      • Centre line - a dashed line that marks the middle of a hole or a symmetrical part of an object

      Common misconception

      The parts in an exploded diagram can be positioned anywhere.

      Parts should be placed along a centre line, positioned vertically or horizontally away from the centre.

      Teacher tip

      Having objects to hand that pupils can pull apart to visualise an exploded diagram can help with explanations.

      Equipment

      Pen, pencil, rubber, ruler.

      Licence

      This content is © Oak National Academy Limited (2026), licensed on Open Government Licence version 3.0
      except where otherwise stated. See Oak's terms & conditions
      (Collection 2).

      Lesson video

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      Prior knowledge starter quiz

      6 Questions

      Q1.
      What is a freehand sketch?

      a digital image
      a sketch drawn using tools only
      Correct answer: a drawing made by hand without using a ruler
      a drawing with labels only

      Q2.
      Adding light and dark areas to a drawing helps create __________.

      Correct answer: tone
      patterns
      colour
      detail

      Q3.
      Match the technique to its purpose:

      Correct Answer:crating,helps draw 3D shapes using a box
      Correct Answer:rendering,adds colour, texture or tone to a drawing
      Correct Answer:annotation,explains parts of the drawing with notes
      Correct Answer:orthographic drawing,shows multiple views of a product

      Q4.
      What is one-point perspective used for?

      to show what a product looks like from above
      to give a flat, 2D appearance
      Correct answer: to show depth by using a single vanishing point
      to colour in a product

      Q5.
      An drawing uses labels to explain parts of the design.

      Correct Answer: annotated, annotate

      Q6.
      What do we use to show texture and surface detail in a drawing?

      perspective
      Correct answer: colour and shading
      measurements
      glue and scissors

      4 Questions

      Q1.
      What is the purpose of an exploded diagram?

      to show the product from one angle only
      to decorate the page with colour
      Correct answer: to show all the parts separated but in the correct positions
      to make a sketch more creative

      Q2.
      A dashed line that shows the middle of a hole or symmetrical part is called a .

      Correct Answer: centreline, centre line, centerline, center line

      Q3.
      Match the feature to its purpose in an exploded diagram:

      Correct Answer:centre line,helps align all the parts
      Correct Answer:equal spacing,keeps the parts visually organised and readable
      Correct Answer:labelling,shows the name or detail of each part
      Correct Answer:explosion direction,shows the assembly layout, horizontally or vertically

      Q4.
      An exploded diagram can be drawn vertically or depending on the design.

      Correct Answer: horizontally, horizontal

      To help you plan your 7 design and technology lesson on: Exploded diagrams, download all teaching resources for free and adapt to suit your pupils' needs...