# SOURCE Lesson Plans Detail

## The Egg Drop Challenge

Topic Engineering Brown Science Prep Manu Venkat, Raghava Kamalesh, Jonathan Sit Undergraduate students

### Overview / Purpose / Essential Questions

How can we engineer safe designs?

### Performance / Lesson Objective(s)

Students will use basic principles of engineering and safety design to create a device that will protect an egg while it is dropped.

### Lesson Materials

List of Materials (per group):

Plastic straws (~30)

Popsicle sticks (~20)

Scotch tape (1 roll)

Paper (10 sheets)

CVS grocery bag (1)

Ziploc sandwich bag (1)

Clear plastic Dixie cups (3)

*note: egg should not fit perfectly in dixie cup (would make it too easy)

Stapler (can be shared between groups)

String or Yarn (~10 feet)

Cardboard (~2 square feet)

### Lesson Motivation

Engineering challenges are a good way to encourage students to participate and engage in science.

### Procedure

Lesson Outline: Car Safety

Part 1: the human body, and what it can handle

- Humans are relatively fragile

- Outside forces applied on our bodies can cause damage

- Ask students: what are some examples of situations where outside forces can injure a person (examples: car accident, falling and hitting the ground, getting punched)

- Ultimately, it is a large forces that cause injury

Part 2: F=MA

- Write equation on the board and define F, M, and A

- (maybe?) talk about Issac Newton, or at least mention that this is one of his laws of motion

- Look at the equation, and figure out what contributes to a higher F (higher M, higher A)

Part 3: Strategies to protect humans from injury

- How can we reduce the forces that are applied to the body during things that can potentially injure us?

- Ask students for examples of things that can protect us from injury (seat belts, parachutes, air bags, helmets)

- Two main ways to protect our bodies: increase the amount of time a force is applied (thereby reducing magnitude of the acceleration), or apply the force over a larger area

Part 4: Increasing the time a force is applied

- A simpler way to say this is “shock absorption”

- If you were falling towards the ground, what would you rather land on? A soft or hard surface? Concrete or a trampoline?

- Why is a soft surface better?  The force that is slowing you down is applied over a longer time!

- Cars: airbags!

- If you got into a crash, its better that your head hits a soft airbag than a hard steering wheel

- This also impacts how cars are designed

- *show crash test video* Cars are now designed to crumple and fold, so that you experience less of a sudden deceleration

- *we could also show stuntpeople landing on cardboard boxes?*

Part 5: Transferring a force over a bigger area

- A given force can do more damage to you if it is applied over a smaller area.  It’s the difference between the effects of getting pushed by the large area of a hand, or getting stabbed by the much smaller point of a sword

- this is how helmets and safety pads work

- Talk about eggs: eggs can handle a large amount of force is it is applied evenly all over the surface of the egg, but you can easily crack an egg with a small force applied on a small area (like a knife)

Part 6: Explain the rules of the egg drop

- Hand out the worksheets: http://sciencespot.net/Media/clubnkegg.pdf

- Talk them through it

Part 7: Tips and tricks for protecting your eggs

- You want to find ways to reduce the force applied to your egg when it hits the ground

- You can find ways to slow the speed of the egg as it falls so that the acceleration when it hits the ground is less.

- Air resistance (parachutes, flying squirrels)

- You can find ways to shock-absorb your egg

- Make an airbag, use padding

- You should make sure the force of impact is transmitted evenly to your egg

- If your egg is surrounded by sharp surfaces, it will probably crack

### Wrap up / Conclusion

Students will test their devices by dropping them from a predetermined height. Students will receive points for how effective their design is.

Students will have the opportunity to make changes to their design after the first drop.

### Supplies List

QtyUnitItem
1BagStraws
1BagChopsticks
1RollTape
1BoxConstruction Paper
1BoxGallon Zipper bags
1BoxPaper cups
1RollYarn
1BoxNotecards

### Alignment Info

Audience(s) High school students Engineering Physical Sciences (RI GSE) PS3.3-4.7aStudents demonstrate an understanding of motion by… predicting the direction and describing the motion of objects (of different weights, shapes, sizes, etc.) if a force is applied to it. Hands-on High School 1 05/29/2013 01:17 PM 12/20/2018 11:57 AM