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In this activity, learners explore center of gravity, or balance point, of stacked blocks.

In this activity, learners build a machine made of craft sticks to multiply the levering motion of their hands and create a device that bends and extends.

In this activity, learners build a simple tabletop seesaw to test how different variables (the position of the fulcrum, distance, weight) affect its balance under increasing weight loads.

In this invention challenge activity, learners see how many objects they can grab with a homemade "bionic" arm.

In this project, students explore how levers work, by making a puppet with moving limbs.

In this activity, learners explore trebuchet design. Teams of learners construct trebuchets from everyday materials.

In this activity, learners explore accuracy and precision.

In this activity, learners build their own construction cranes using tongue depressors and pushpins.

In this activity, learners build mini-basketball courts using cardboard and measuring spoons. Use this activity to introduce learners to catapults, forces, and levers.

In this activity, learners consider how a simple machine, a lever, turns a small push or pull (a small force) into a larger--or stronger--push or pull (a larger force).

In this dynamic activity, learners build a catapult that launches projectiles, such as marshmallows.