Students determine the relationship between the stretch of a spring and the number of weights in a cup suspended from the spring. They find the Y-value of a function if the X-value is provided. They use technology to plot a set of ordered pairs and to find a best fit line.

Before the Activity

Place the slinky on the center of a meter stick at a certain height above the floor, and hang the cup on the slinky

Set up the calculator for data collection using the procedure described in the attached Appendix PDF file

See the attached PDF file for detailed instructions for this activity

Print pages 123 - 134 from the attached PDF file for your class

During the Activity

Distribute the pages to your class.

Follow the activity procedures:

Measure and record the distance from the cup to the floor

Add 5 marbles (or any small object) to the cup and measure and record the distance from the cup to the floor

Continue adding marbles in increments of five and record data

Enter the number of objects and the distance as a list

Set up a scatter plot and find the equation for the number of objects versus the length of the slinky

Find the y-intercept, and determine the slope

Find a best fit line, graph it, and record its slope

Compare the stretch for different objects

Determine the stretch for a given number of the same objects, and the number of objects given the stretch

After the Activity

Students will complete the Data Collection and Analysis page and answer questions listed on it.

Review student results

As a class, discuss questions that appeared to be more challenging