Toad Haven Homeschool

Toad Haven Homeschool

Today we tried some Barbie bungee jumping! I had seen it done before and wanted to try it out. Great idea! The idea is to create competing bungee jumping companies and then take various measurements to predict how long the bungee cord (rubber band chain) needs to be and then test it out on your Barbie clients. The goal is to make the jump the most thrilling by getting her the closest to the ground without actually touching the ground. FUN!

Ethan named his bungee company Dergle’s Bungee Jumping Services and this was his victim client.

Emily named her company The Groovy Lads’ Bungee Jump, Inc and this was her client.

First, I had the kids estimate the height of the drop using my height and a yard stick as visual references to help estimate. Then they each measured out a piece of yarn the length that they estimated the drop height to be.

We tied erasers tot eh end to represent their clients’ heads. Then they dropped them to see if they did a good job estimating or not.....whether their client would have lived or died....before we actually let the Barbies take the plunge.

Whew! They both would have lived so that was good. Pretty good estimating. We noted that Ethan’s company, on the left, would probably have more happy customers since it would be the most thrilling since it got so close to the ground but I would prefer Emily’s company if I had to jump because it seems less scary since I wouldn’t really be in danger of hitting the ground.

Next, we wrapped rubber bands around the clients’ feet and attached a bungee cord (another rubber band)

Then one person held the jumper and the bungee cord and then let her go while the other person watched to see how far she dropped. Then we added 2 more rubber bands on and repeated the process. Then we added 2 more rubber bands and repeated the process again.

We used our finding to predict how many rubber bands it would take to make the best, most thrilling bungee jump without killing our clients.

Emily chose to try taking her client’s final drop length and dividing it by the number of rubber bands she used to get the average length that each rubber band would give the client.

Ethan noted that there was a predictable pattern that formed in the drop length with each rubber band that was added and so worked out a formula that he thought would work.

When I originally saw this projected posted online, it is always done in an algebra class and with algebraic formulas. They involve plotting the x and y numbers on a graph and determining the slope. Ethan hasn’t gotten to this in his algebra lessons yet so they just figured it out any way they could.

This was Ethan’s thought plan

By Ethan’s calculations, he was going to need 17 rubber bands. He made a chain of rubber bands was took his client up for the jump.

Barbie’s bungee jump at Dergle’s Bungee Jump Services - sorry, couldn’t figure out how to flip the video so it is sideways :(

Barbie’s jump at The Groovy Lads’ Bungee Jump, Inc

Here are some of the Barbie bungee algebraic worksheets

Barbie Bungee (Illuminations)

Barbie Bungee (Linear Regression)

Barbie Bungee Data Collection Activity

Emily’s Barbie went for a ride on the dog afterwards.

The Barbies soon became yo-yos and are now just hanging around :)

Barbie Bungee Jump Math

Thursday, January 26, 2012