Egg drop challenge
01 // Question
How does padding amount affect egg damage when matched capsules are released from the same safe height?
Change only the padding amount, keep the design and drop conditions consistent, and repeat each design with a fresh egg.
02 // Variables
Independent
Amount of cushioning material- 1 layer of padding
- 3 layers of padding
- 5 layers of padding
Dependent
Egg survival and visible damage after each drop- PASS if shell is uncracked; FAIL if cracked or leaking
- Passes out of 3 trials and visible crack location
03 // Hypothesis
IF the same capsule uses more layers of the same cushioning material, THEN the egg may show less damage after the same-height drop, BECAUSE well-fitted padding can lengthen the stopping interval or spread contact, though fit and construction also affect the outcome.
04 // Procedure
1. Set a fair test and constraints
Change only padding amount: use one, three or five layers of the same material in matched outer capsules. Keep egg orientation, capsule, release, and landing area the same.
2. Build and label three designs
Center the egg so it cannot strike a hard wall. Label each design and check that padding is the planned difference; photograph or sketch each layout before testing.
3. Mark one adult-reachable height
Use 0.9 m (3 ft) only if the adult can release from the floor without reaching, stretching, or climbing. An adult selects the height and performs every drop; otherwise lower it.
4. Repeat with fresh eggs
At the same height, have the adult release each capsule straight down without throwing. Use a new, similar-size egg for every drop: three drops per design, nine eggs total.
5. Record damage and compare
Mark PASS only if the shell is uncracked; any visible crack or leak is FAIL. Note where damage occurs, count passes out of three, and compare observed patterns without naming a guaranteed winner.
Materials // Prepare the bench
- Raw eggs
- paper
- cardboard
- straws
- tape
- rubber bands
- scissors
- meter stick
- catch tray
- goggles
05 // Data table
| Design (padding) | Trial 1 | Trial 2 | Trial 3 | Passes / 3 |
|---|---|---|---|---|
| 1 layer | ____ | ____ | ____ | ____ |
| 3 layers | ____ | ____ | ____ | ____ |
| 5 layers | ____ | ____ | ____ | ____ |
Record visible damage after each drop
| Design | Trial 1 crack location | Trial 2 crack location | Trial 3 crack location |
|---|---|---|---|
| 1 layer | ____ | ____ | ____ |
| 3 layers | ____ | ____ | ____ |
| 5 layers | ____ | ____ | ____ |
Formula Record the chosen low release height: ____ m (use the same height for all designs). Optional pass percentage = passes ÷ 3 × 100% (descriptive for this small sample only)
06 // What to expect
More cushioning may reduce visible damage when it fits well, lengthens the stopping interval or keeps the egg from striking the outer shell. It is not a guaranteed outcome: loose fit, movement, concentrated contact, uneven construction or egg-to-egg differences may change which design passes.
Three trials per design show a small sample, not a safety rating or force measurement. Report each PASS/FAIL result and crack location, compare the pass counts, and describe any pattern as evidence from this setup only.
07 // Lab notes
- Use a low, adult-selected release point that the adult can reach while standing on the floor. Never use a ladder, stairs, chair, balcony or elevated platform; lower the height if the release is not comfortable and controlled.
- Mark and clear a drop zone; keep everyone out of the fall path. Place the same stable catch tray or padded landing area on the floor for every drop. Do not throw the capsule.
- Use a new, similar-size egg for every individual drop. A previously dropped egg can have a hidden crack and is not a fair next trial.
08 // Remember
Keep the height and drop conditions the same. Use a fresh egg for every trial and report what the test actually shows.
09 // Define a test the class can compare
An egg-drop challenge is an engineering test, so define the constraints before anyone builds: allowed materials, total size, release height, landing surface, and whether the device may be modified between trials. Use eggs of similar size and inspect each one before the drop. Assign a device ID and take a quick photo so the design can be compared with its outcome rather than remembered loosely afterward.
For this lesson, padding amount is the changed factor; compare matched one-, three- and five-layer capsules at one low height the adult can reach while standing on the floor. Use about 0.9 m (3 ft) only if comfortable and controlled, and lower it if not. Use the same landing area and three new, similar-size eggs per design. Record pass/fail and visible crack location; a successful drop does not prove a design is best or universally protective.
10 // Use evidence to improve the structure
Well-fitted cushioning may lengthen the time or distance over which an egg slows, spread contact, or help keep the egg from hitting a hard wall. Students should explain what the padding is intended to do and use the actual damage pattern to judge what happened; extra material does not guarantee a pass.
For each of three trials, record the design, same release height, PASS/FAIL, and crack location. If the egg cracks, note whether contact appears concentrated or the egg moved inside. Change one design feature at a time during redesign. A small sample can suggest a pattern but cannot measure impact force.
11 // Safety and engineering limits
Choose one low floor-reachable height; the adult performs every release while standing on the floor. Never use a ladder, stairs, chair, balcony or elevated platform. Mark and clear the drop zone, release straight down without throwing, and use the same stable floor-level landing area. Clean broken egg promptly, wash hands, and disinfect the landing area; raw egg can carry Salmonella.
A useful extension is to compare a crumple zone, suspension or restraint while holding the other parts constant. Students can sketch predicted force paths before testing. Report only these low, fixed-height trials. A classroom egg test does not measure force or show that a small container would protect a person in a real crash.
12 // Read a failed drop as useful design data
A pass-or-crack result gives only part of the story. Photograph the device before each run and note whether the egg hit the base, a side wall, or a loose internal support. Those patterns suggest different redesigns: add cushioning where contact occurred, secure the egg if it moved, or widen a base that landed unevenly. Do not change padding, container shape, and another test condition at once; otherwise the next result cannot show which change mattered.
For this comparison, use the same low adult-reachable floor-level height, capsule and landing area for every design. Record three fresh-egg trials per padding amount, including PASS/FAIL and damage location. A small classroom sample cannot measure impact force or prove protection for equipment or a person; it only compares the specified models and conditions.
13 // Make a design comparison another team can repeat
Keep a short constraint card with the permitted material list, maximum device dimensions, egg orientation, low release height, landing surface, and damage rule. Record the device mass and draw or photograph its internal supports before each test. Those details help explain why two containers behave differently and stop a redesign from quietly changing several features at once.
Use a new, similar-size egg for each planned drop and inspect it before the release. Mark a result as invalid only for a rule chosen in advance, such as a visible handling crack before testing; keep ordinary design failures in the results. A small set of drops can guide classroom redesign, but it cannot establish a safe package rating or measure impact force.
14 // Questions people ask
Why might padding reduce damage in an egg drop?
Well-fitted cushioning can lengthen the time or distance over which the egg slows, or spread contact across the shell. This may reduce damage, but the result also depends on whether the egg moves inside the capsule and where the structure contacts it.
Why use a fresh egg for every drop?
A hidden crack from an earlier trial could make a later result fail for the wrong reason. Use a new, similar-size egg for each individual drop and report the small sample size.
Why compare all designs at one fixed height?
Keeping release height, landing area, capsule and release method the same isolates the planned padding difference. A pass/fail test shows only what happened in those trials; it does not reveal a maximum safe height or certify protection.
15 // Keep going
Can you explain the investigation?
Egg drop challenge · Student Data Sheet
Question: How does padding amount affect egg damage when matched capsules are released from the same safe height?
Hypothesis: If the same capsule uses more layers of the same cushioning material, then the egg may show less damage after the same-height drop, because well-fitted padding can lengthen the stopping interval or spread contact, though fit and construction also affect the outcome.
Materials
- Raw eggs
- paper
- cardboard
- straws
- tape
- rubber bands
- scissors
- meter stick
- catch tray
- goggles
Safety before starting
- An adult chooses one low release height reachable while standing on the floor and performs every drop; lower it if needed. Never use a ladder, stairs, chair, desk, balcony, railing or raised platform. Mark a clear drop zone and keep everyone outside the fall path.
- Raw eggs can carry Salmonella. Keep the egg away from food, wear gloves for cleanup, and wash hands and the surface after a break.
Lab notes
- Use a low, adult-selected release point that the adult can reach while standing on the floor. Never use a ladder, stairs, chair, balcony or elevated platform; lower the height if the release is not comfortable and controlled.
- Mark and clear a drop zone; keep everyone out of the fall path. Place the same stable catch tray or padded landing area on the floor for every drop. Do not throw the capsule.
- Use a new, similar-size egg for every individual drop. A previously dropped egg can have a hidden crack and is not a fair next trial.
Variables
Independent: Amount of cushioning material · Dependent: Egg survival and visible damage after each drop
Keep constant: same outer capsule · same padding material and egg orientation · matched fresh eggs · same adult-selected floor-level height (record it) and landing area · adult releases without throwing
Procedure
- Set a fair test and constraints: Change only padding amount: use one, three or five layers of the same material in matched outer capsules. Keep egg orientation, capsule, release, and landing area the same.
- Build and label three designs: Center the egg so it cannot strike a hard wall. Label each design and check that padding is the planned difference; photograph or sketch each layout before testing.
- Mark one adult-reachable height: Use 0.9 m (3 ft) only if the adult can release from the floor without reaching, stretching, or climbing. An adult selects the height and performs every drop; otherwise lower it.
- Repeat with fresh eggs: At the same height, have the adult release each capsule straight down without throwing. Use a new, similar-size egg for every drop: three drops per design, nine eggs total.
- Record damage and compare: Mark PASS only if the shell is uncracked; any visible crack or leak is FAIL. Note where damage occurs, count passes out of three, and compare observed patterns without naming a guaranteed winner.
Record your observations
| Design (padding) | Trial 1 | Trial 2 | Trial 3 | Passes / 3 |
|---|---|---|---|---|
Record visible damage after each drop
| Design | Trial 1 crack location | Trial 2 crack location | Trial 3 crack location |
|---|---|---|---|
Formula: Record the chosen low release height: ____ m (use the same height for all designs). Optional pass percentage = passes ÷ 3 × 100% (descriptive for this small sample only)
Answer key and expected pattern
More cushioning may reduce visible damage when it fits well, lengthens the stopping interval or keeps the egg from striking the outer shell. It is not a guaranteed outcome: loose fit, movement, concentrated contact, uneven construction or egg-to-egg differences may change which design passes.
Three trials per design show a small sample, not a safety rating or force measurement. Report each PASS/FAIL result and crack location, compare the pass counts, and describe any pattern as evidence from this setup only.
Remember: Keep the height and drop conditions the same. Use a fresh egg for every trial and report what the test actually shows.