Laboratory activity do long bones break more easily than short bones

1. MENTARI INTERCULTURAL SCHOOL
IB MIDDLE YEARS PROGRAM
Assessment Objectives:
• Identify the parts and function of human skeleton system.
• Compare bones of the human skeleton system.
• Measure the force needed to make the straw bend.
Introduction: In this experiment, you will use drinking straws instead of real bones. You will measure the force
needed to make the straw bend, rather than break. The diagram shows how you will find the force needed to bend
the straw. You will use a spring balance. It’s easiest to do this in pairs. One of you pulls the spring balance. The other
one notes the reading on the spring balance when the straw collapses.
Data Table [Level 5-6]
QUESTION:
What conclusion can you make from your results? [Level7-8]
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Reference:
Jones, M., Fellowes-Freeman, D., & Sang, D. (2013). Cambridge Checkpoint Science Coursebook 7. United
Kingdom: Cambridge University Press 2013.
Student Name: CN 2nd
Term SY 2018 - 2019
Grade Level: 8 Date: Parent’s Signature
Section: Teacher: Armand Anthony L. Galicia
Formative Assessment – Laboratory Activity
Unit/Topic: Do Long Bones Break More Easily Than Short
Bones?
The Differences of the Forces Needed to Bend the Straw
Length of Straw in [cm]
Force Needed to Bend the
Straw [N]
Procedures:
1. Collect two identical straws. Keep one full length. Cut one
in half. Cut one of the halves into half again.
2. Measure the length of a full-length straw, in cm. Fill in your
measurement in the first row of your results table.
3. Find the force needed to make a full length straw bend.
Write your result in your results table.
4. Now repeat steps 3 and 4 with the half-length straw and the
one-quarter length straw.