Video Description -- Paper Hand Model
Make a paper hand model using straws and paper.
Materials:
• 1 piece of construction paper
• 5 straws
• 5 beads
• 1 spool of string
• 1 roll of tape
• 1 pair of scissors
• 1 writing utensil
Prep:
Cut out five pieces of string per hand. Strings should be a few inches longer than the full length of your hand.
Procedure:
1) Use the writing utensil to trace your hand. Include the joints. Index fingers have 3 joints and so on.
2) Use the scissors to cut out the trace.
3) Position one straw over each paper finger and mark on the straw where the finger joints are.
4) Cut small diamond-shaped holes in the straw at each joint mark. Make sure all your diamonds face the same way.
5) Tie a bead onto each end of the string.
6) Feed one string through each straw so that the beads are at the top ends of the fingers.
7) Place each straw onto a paper finger.
8) Tape the straws into place. Avoid putting tape on the joints.
9) Pull the strings
Science
• There are no muscles in your fingers.
• Each string represents the tendons that are attached to your fingers. Muscles in the palm of your hand and in your forearm allow you to bend your fingers. This wouldn't work without joints though!
• The ratio of length between your ring finger and index fingers has been shown to indicate many things including aggressiveness.
• The state of your fingernails can indicate your health. Vitamin/mineral deficiencies will usually affect how your fingernails look/feel.
• While they look different, the structure of the fingernail makes it defined as hair.
• There's a point where all the fingers in your hand should point towards. Can you find it?
• Experiment:
o Make a study of the people in your life. Use math to find the ratios of the ring/index finger. Compare the results.
o Make a study of the people in your life. Find the points everybody's fingers point to (and map it!). Compare the results.
o Make a model of a hand that has no joints or simulates the hardening of joints (arthrosclerosis). What happens?
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