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Discuss the questions in the "Brainstorm and Design" section. Brainstorm and design (10 minutes) - Distribute the challenge sheet.Improving a design based on testing is called the engineering design process. As you test your design, you’ll find ways to make it work better. Just as the success of LCROSS depends on hitting the crater exactly, success in today’s activity depends on being able to hit the target accurately and consistently. Today you’ll turn a paper cup into something that can zip down a line and drop a marble onto a target. Show kids how the cup travels down the zip line. Hang the cup on the zip line, using a hook made of a paper clip.

Scientists will study this plume to see if there are any signs of water in it. The collision will send up a plume of dust and gas over 6 miles (10 km) high. To see if there’s water on the moon, NASA is sending the Lunar Crater Observation and Sensing Satellite (LCROSS) hurtling into a crater near the moon’s South Pole.

Tell kids how NASA used the LCROSS spacecraft to search for water on the moon.

Optional: Print a picture of the Lunar Crater Observation and Sensing Satellite (LCROSS) from the NASA website.

(In other words, don't make a door or platform for the marble.)

Read the challenge sheet and activity details to become familiar with the activity.

Student challenge sheet - download PDF Management Target drawn on a piece of paper (per zip line) Materialsĩ feet (3m) of smooth line (e.g., fishing line or kite string) (per zip line) Students will follow the engineering design process to modify a cup to carry a marble down a zip line attach a string to tip the cup test their cup by sliding it down the zip line, releasing the marble, and trying to hit a target on the floor and improve their system based on testing results. OverviewIn this challenge, kids modify a paper cup so it can zip down a line and drop a marble onto a target.