How can you move something great distances with something as simple as string? In this experiment, you’ll use a Ziploc® brand sandwich bag, string, and two chairs to build a mini-gondola. Once you construct your system, fill the bag with a secret message and pull the string to deliver your message! How does pulling and pushing the string change the direction of the system?

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Pull the string in different directions to move things along. If you tug on the string on the side with the gondola attached, it'll move toward you. If you pull on the other side of the string, it'll move the opposite direction, away from you. This happens because the string wraps around the chair and connects, creating a cable car system. How else can you pull (or push) on the string to make the gondola move? If you pull faster or slower how does that change the gondola's speed?

Connections with Next Generation Science Standards (NGSS)

Motion and Stability: Forces and Interactions K-PS2-1

Plan and conduct an investigation to compare the effects of different strengths or different directions of pushes and pulls on the motion of an object.

Pushing and pulling the string in the gondola system will move the bag attached to it. If pulled faster, the bag will move faster.