Spider Web Lesson Plan
STEM Biomimicry Comparative Material Challenge • Grades 3–5
60–75 Min Teams of 2–3
Spider Web Engineers
Choose-One Challenge: String, Rubber Bands, Fishing Line, or Pipe Cleaners
Essential Question & Variable Investigation
Spiders produce different silks with unique properties (tensile strength vs stretch). When students choose ONE material—string, rubber bands, fishing line, OR pipe cleaners—how do the material's properties affect web strength, sag, and apple support?
NGSS Alignment
- • 3-5-ETS1-1: Define constraints & criteria
- • 3-5-ETS1-3: Plan & conduct fair test comparisons
- • 4-PS3-3 / 4-LS1-1: Structure, function & elasticity
Target Learning Objectives
1. Material Selection Predict how one chosen material's properties mimic spider silk tensile strength or stretch.
2. Anchor Engineering Fasten web radials securely to a paper plate rim using tape or staples under load tension.
3. Cross-Group Data Compare performance (sag depth & hold time) across all 4 material types with a 180g apple.
Challenge Supplies: Common Frame + Choose ONE Filament
Shared Base Supplies
- • 1–2 Paper Plates (rim frame)
- • Tape OR Staples (rim anchors)
- • 1 Fresh Apple (~180g)
- • 1 Ruler & 1 Pair Scissors
Choose ONE Material per Team
Option A: String Frictional grip, moderate stretch, easy to knot, holds radial spoke tension well.
Option B: Rubber Bands Extreme elasticity, absorbs prey impact, but risks excessive sag under weight.
Option C: Fishing Line Ultra-high tensile strength, near-zero stretch, but slippery to anchor firmly.
Option D: Pipe Cleaners Stiff bendable wire core, self-linking without knots, but can bend permanently.
Biomimetic Science Comparison Independent Variable: Material Type
Real spiders produce up to seven distinct silks. By assigning or letting teams choose among string, rubber bands, fishing line, or pipe cleaners, the class conducts an authentic comparative investigation into how fiber material properties dictate load-bearing success!
Spider Web Engineers • Teacher Instructional Guide Page 1 of 2
Instructional Sequence & Facilitation Comparative Engineering Design Process
10 Min Phase 1
Ask & Hook: The 4 Material Candidates
Introduce the challenge: Which material builds the strongest biomimetic web to hold an apple for 10s? Display the 4 options: string, rubber bands, fishing line, and pipe cleaners. Teams select ONE and form a hypothesis.
15 Min Phase 2
Plan: Material-Specific Web Blueprints
Teams sketch blueprints tailored to their material: Team Pipe Cleaner plans twisted wire joints; Team Rubber Band plans interlinked loops; Team Fishing Line/String plans spoke counts (min 6–8 radials) and tape vs staple anchors.
25 Min Phase 3
Create: Build on Paper Plate Rim
Students cut out the inner circle of the plate (leaving a 1.5-inch rim). Teams attach their chosen material using tape or staples. Facilitation: Remind teams to pull spokes taut before weaving inner capture loops.
15 Min Phase 4
Test & Measure: Load Trial & Class Data Board
Place the plate frame across two books or blocks. Gently lower the apple to the center. Time 10 seconds and measure sag deflection (cm below rim). Post results on a class chart to compare the 4 materials.
10 Min Phase 5
Improve & Debrief: Comparative Science Synthesis
Teams analyze why their material succeeded or failed. Lead whole-class discussion: Which material had the least sag? Which anchored best? How do real spiders combine multiple silks to get the best of all materials?
Material-Specific Troubleshooting Guide
String: If string slips under tape, fold tape over string and staple through both.
Rubber Bands: If bands stretch apple to the table, double up bands or chain smaller loops.
Fishing Line: Monofilament slips easily; wrap twice around plate rim before stapling/taping.
Pipe Cleaners: If spokes bend permanently in the center, twist two cleaners together for strength.
Formative Assessment Rubric (12 Points Total)
| Criteria | Proficient (3 pts) | Developing (2 pts) | Beginning (1 pt) |
|---|
| Material Application | Skillfully leverages chosen material properties in web architecture. | Uses chosen material but struggles with anchor tension. | Haphazard construction without considering material traits. |
| Load & Sag Test | Holds apple 10+ sec with minimal sag (<3cm). | Holds apple 10 sec with >4cm sag or rim warping. | Apple drops through immediately or anchors detach. |
| Comparative Analysis | Compares chosen material results to other materials accurately. | Identifies team failure but cannot compare with peers. | Does not explain why material succeeded or failed. |
Spider Web Engineers • Teacher Instructional Guide Page 2 of 2
Spider Web Slides
STEM Maker Challenge Grades 3–5 Engineering
EDP LAB
Comparative Material Investigation
Spider Web Engineers
Choose your material & build a web to hold a heavy apple!
String • Rubber Bands • Fishing Line • Pipe Cleaners
Slide 1 of 6
Core Science Concept
What is Biomimicry?
Bio = Life + Mimicry = Imitating = Nature's Blueprints!
Biomimicry is when engineers and scientists solve human challenges by copying clever structures and materials found in nature.
Velcro
Inspired by tiny burdock plant hooks that cling to animal fur.
Bullet Trains
Shaped like the kingfisher bird's beak to travel quietly at top speed.
Spider Silk
5× stronger than steel wire! Guides bridges, cables, and armor.
Structural Engineering
Anatomy of an Orb Web
1. Radial Spokes
- • Straight lines connecting the center hub to the outside rim.
- • Taut, strong silk that carries the weight.
- • Must be pulled tight before adding spirals!
2. Capture Spirals
- • Concentric circles looping across all spokes.
- • Stretchy silk that creates a catching surface.
- • Gaps must be smaller than the apple!
Paper Plate Frame: Cut out the center circle to form a rim. Use tape or staples to anchor your web!
Challenge Mission
Choose ONE Web Material!
Hold Apple for 10s
Option A
String
Traditional yarn or twine. Great friction, easy to knot, moderate stretch.
High Grip • Easy Tie
Option B
Rubber Bands
Extreme elasticity! Absorbs shock, but watch out for heavy apple sag.
Super Stretch • Shock Catch
Option C
Fishing Line
Maximum tensile strength! Zero stretch, but slick and tricky to anchor.
Ultra Strong • Slick Grip
Option D
Pipe Cleaners
Flexible wire core. Twists and holds shape, but can bend permanently.
Wire Core • Twist Fast
Every team gets: Paper Plate Frame + Tape or Staples Pick YOUR material in your Lab Notebook!
Spider Web Journal
Student Lab Notebook Choose-One Material Challenge
NGSS 3-5-ETS1-3
Engineer Name:
Team / Partner:
Date:
Mission: Can Your Chosen Material Hold an Apple?
~180g Load • 10 Sec
Select ONE web material (string, rubber bands, fishing line, or pipe cleaners). Build an orb web inside a paper plate frame with tape or staples to support an apple for at least 10 seconds!
Step 1: Circle Your Team's ONE Chosen Material Choose exactly 1
• String • High grip, easy knots, medium stretch
• Rubber Bands • Super elastic, shock catch, high sag
• Fishing Line • Max tensile strength, zero stretch, slick
• Pipe Cleaners • Bendable wire core, twists, can warp
Our Hypothesis (Why we picked this material & how it will support the load):
Phase 2: Paper Plate Blueprint (Sketch Spokes & Spirals)
Outer rim = Paper plate edge
Top Rim
Bottom Rim
Left Rim
Right Rim
Planned Radial Spokes:
Planned Spiral Rings:
Anchor Fastener (Tape/Staples):
Spider Web Engineers • Student Design Notebook Page 1 of 2
Phase 3 & 4 Testing, Failure Analysis & Redesign
Comparative Engineering
Material Load Testing Log
| Test Trial | Load Weight | Time Held | Sag Depth | Observations & Failure Point |
|---|
| Trial 1 | | | | |
| Initial Build | 1 Apple (~180g) | | | |
| Trial 2 | | | | |
| 1st Redesign | 1 Apple (~180g) | | | |
| Trial 3 | | | | |
| Final Design | 1 Apple (~180g) | | | |
Failure Diagnostic Checklist (What happened to your material/frame?):
Material stretched to the table Slipped out from tape/staples Material snapped or untwisted Paper plate rim folded inward Apple slipped through gaps Held apple for 10+ seconds!
Our Engineering Fix (How did you modify the web or anchors?):
Phase 5: Science & Comparative Reflection
1. How did your chosen material's properties (strength, elasticity, or stiffness) affect how well your web held the apple?
