Pendulum Model

Pendulum Investigation (based on: http://modeling.asu.edu/modeling/DB_AAPTtalk.pdf)

With a pendulum set up at front of room, have students discuss observations then brainstorm what can be measured. List everything that might effect what they see happening. Narrow list to include only variables that they can consistently measure to get at least six different data points to put on a graph. So humidity or temperature will be eliminated because you can't get six different humidity or temp measurements in one class period. Then given a stop watch (phone) and meterstick plus pendulum equipment, they will work in groups to take data and prepare a whiteboard presentation. This WB must include the following: written description of the relationship they have found, diagram of set-up, graphical representation, and algebraic representation, justification, and conclusions.

This activity worked well this year. (No time to go over HW...could be a problem). The timing was about right with the following schedule:
8:10-8:15   Come in and get settled. Have HW out on table will collect later. Lab groups listed on SmartBoard.

8:15-8:30   Observe pendulum-record variables that can be measured. Narrow down list to be reasonable. Decide on 6-8 data points. Groups will try to answer the question, "What is the relationship, if there is one, between __________ and ____________?" Their groups will decide which variable go in the blank. Groups decide how to take data, and record in notebooks. Try to get a variety of investigations...at least some mass-time, and length-time. Find a way to get them to use small swings of less that 45 degrees.

8:30-8:55   Take data. Keep class posted about how much time is left to keep them on pace. When about 5-8 minutes are left have them stop taking data and start making a graph in their notebooks. They will decide how to orient variables and axes.

9-9:05   Break

9:05-9:15   Create a WB presentation. Have these criteria on the SB:

1.Diagram of set-up with variables labeled
2.Written description of problem to be investigated.
3.Graphical representation of the investigation.
4.Mathematical representation of the result.
5.Written conclusion of investigation.
6.Names of group members.

9:15-9:35   WB presentations. Try to have everyone in group contribute. Try to have others ask questions.

9:35-9:40   Wrap up. Collect HW.