Sci-ber Text - 8th Grade

Force, Energy, & Motion - Complex Machines for Simple Tasks!

This is an actual student-built apparatus. The student determined that the purpose of this apparatus was to prepare a bowl of cereal for breakfast. It worked so well, that it was used by his family to prepare a bowl of Fruit Loops® for a period of time!

The purpose of this activity is to design a working apparatus made of various simple machines. It is used to perform a task. It is based on the ideas of Rube Goldberg®. Historically, Rube Goldberg® was a cartoonist who designed such machines to make fun of inventions. The Official Rube Goldberg Web Site explains the history behind this activity, in addition to great background information about Rube Goldberg®.

Your job for this activity is to create a twenty-step simple machine apparatus to perform any task that you wish. Ideas for tasks include the following: fold a napkin, fill the food dish for a pet, open a pop can, screw the lid on or off of a jar, turn on or off a light, turn the pages of a book, inflate a balloon, prepare a bowl of cereal, smash a grape, pour a drink into a cup, prepare a tossed salad, place toothpaste on a toothbrush, cook an egg, turn on or off a radio ... the list is only as limited as the permission from an adult!

Do NOT design an apparatus to throw objects, or do anything that could harm a person!

Materials:

Your choice of materials. You might need to get permission from an adult to use some of the materials.
The materials may be very inexpensive if you use materials around the house.

Examples of materials include:

Wood
PVC pipe
Building toys like Legos®, Tinker Toys®

Do NOT use a mouse trap or a rat trap!

Procedure:

Design the apparatus on paper as a "blueprint" before you begin building.
Make sure to identify each of the simple machines (such as levers) to make sure to include yhe required twenty in the apparatus!
Make sure that the apparatus is built with a solid base.
Make sure the apparatus can fit through a doorway so that you can share it with your friends!
Demonstrate the working apparatus to friends, family, or your teacher.
Do NOT design an apparatus to launch objects or possibly harm a human or animal!
Make sure to clean up any mess that you or your apparatus creates!
Use as many simple machines as you possibly can.

Watch this sample video of an actual student-built 20-step simple machine apparatus.

Safety concerns: Be sure to follow all electrical, and heat safety rules that are specified by your teacher in all general laboratory experiences. As with all science lab activities, the most important safety rule is to follow all teacher directions.

Analysis:

What was the easiest part of the apparatus to design?
How many different simple machines did you use in the project?
What task were you trying to do?
- Were you successful in completing your task?