A catapult is a lever, a stick or beam propped up by a fulcrum (a pivoting point). A lever will magnify the force you put on it if the fulcrum (the pivoting point) is closer to your force than it is to the load.

The catapult magnifies your force to throw a pompom in this activity. The larger the force, the farther the pompom goes.

These activities are part of Science World's Big Science for Little Hands program. They were developed and tested with Preschool and Kindergarten educators.

### Objectives

• Use ramps, pulleys, levers and pendulums.

### Materials

• A lever arm (e.g. wooden ruler or jumbo popsicle stick)

• A round fulcrum (e.g. spool of thread or fat marker)

• Elastic bands

• Spoons

### Key Questions

• Can you get your pompom to the target/across the "water"?
• How can you change the distance the pompom travels?
• Where should the pivot point (fulcrum) be positioned to make the pompom travel the shortest distance?

### What To Do

1. Assemble the catapults ahead of time for younger students.
2. Create “target zones” on the ground or a table using chalk or tape, based on your catapult’s range.
3. Demonstrate how to load and launch the catapults.
4. Encourage children to try them out.
5. Try adjusting the force you use with the catapults to fire the pompoms different distances into different zones (e.g. push gently to move the load a short distance, push hard for a longer distance.

### Extensions

• For younger children, set up the fulcrums of several catapults, each in a different position.
• Which catapult flings the pompom farther?
• For older children, challenge them to adjust the location of the fulcrum themselves and see how it affects the distance the load travels.
• Hint: Set up the catapult with the fulcrum positioned so that it is least efficient at the start of the exploration to encourage children to adjust it.
• Theme the target zones, such as water with alligators or castles with guards. Add boxes or buckets to aim for.
• Competition – who can make their pompom travel the furthest?
• Have children design and decorate their own catapult.
• Learn about the history of the catapult and trebuchet.
• Explore teeter-totters and other levers in your neighbourhood.
• Build a giant catapult outdoors and launch water balloons or pumpkins.

Survivors

Artist: Jeff Kulak

Jeff is a senior graphic designer at Science World. His illustration work has been published in the Walrus, The National Post, Reader’s Digest and Chickadee Magazine. He loves to make music, ride bikes, and spend time in the forest.

Egg BB

Artist: Jeff Kulak

Jeff is a senior graphic designer at Science World. His illustration work has been published in the Walrus, The National Post, Reader’s Digest and Chickadee Magazine. He loves to make music, ride bikes, and spend time in the forest.

Comet Crisp

Artist: Jeff Kulak

Jeff is a senior graphic designer at Science World. His illustration work has been published in the Walrus, The National Post, Reader’s Digest and Chickadee Magazine. He loves to make music, ride bikes, and spend time in the forest.

T-Rex and Baby

Artist: Michelle Yong

Michelle is a designer with a focus on creating joyful digital experiences! She enjoys exploring the potential forms that an idea can express itself in and helping then take shape.

Buddy the T-Rex

Artist: Michelle Yong

Michelle is a designer with a focus on creating joyful digital experiences! She enjoys exploring the potential forms that an idea can express itself in and helping then take shape.

Geodessy

Artist: Michelle Yong

Michelle is a designer with a focus on creating joyful digital experiences! She enjoys exploring the potential forms that an idea can express itself in and helping then take shape.

Science Buddies

Artist: Ty Dale

From Canada, Ty was born in Vancouver, British Columbia in 1993. From his chaotic workspace he draws in several different illustrative styles with thick outlines, bold colours and quirky-child like drawings. Ty distils the world around him into its basic geometry, prompting us to look at the mundane in a different way.

Western Dinosaur

Artist: Ty Dale

From Canada, Ty was born in Vancouver, British Columbia in 1993. From his chaotic workspace he draws in several different illustrative styles with thick outlines, bold colours and quirky-child like drawings. Ty distils the world around him into its basic geometry, prompting us to look at the mundane in a different way.