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Max Moliken

April 4, 2015

Averages:

Conclusion:

To improve my experiment for next time, I could scoop sand more slowly and meticulously.

Analysis:

This data could be used in the real world to improve the structural support of houses to make them more stable and sturdy

My hypothesis was correct because the 3/4" diameter stick held the most weight(about 57 kg).

  • To avoid errors, I scooped spoonfuls of sand and gravel into the bucket to make my measurements as exact as possible.
  • I also placed Styrofoam padding on the ground to avoid jarring, breaking or spilling the bucket of sand onto the ground.
  • A single, thick rod will hold more weight than multiple, thinner rods.
  • The multiple thinner rods will not always break as one
  • The single thicker rod will not be as malleable as the multiple thinner rods
  • The bar graph shows that as each individual rod diameter gets smaller, the weight required to break the group of rods is almost exactly half of the weight required to break the level preceding it.

Constants:

  • Materials
  • Location
  • Rig
  • Method of adding weight

Procedure:

  • Scotch tape the groups with multiple rods
  • Duct tape rig components together
  • Attatch rig
  • Add base weight
  • Add additional weight
  • Record final weight (breaking point)
  • Repeat for remaining groups
  • Convert lbs. to kg
  • Calculate averages
  • Graph info

Trials and Repeats

Iv:

Dv:

How much weight can each 3/4" group of rods support (Measured in kilograms{kg})

------------------------------

Diameter of individual sticks per 3/4" group

-------------

  • 3/4"
  • 3/8"
  • 1/4"
  • 1/8"

Oh, Snap!

Materials

  • Gravel
  • Camera (GoPro)
  • Duct Tape
  • Scotch Tape
  • Notebook
  • Pencil
  • Styrofoam

  • 2x4 Planks (4)
  • Plywood Sheet
  • Eye Hooks (4)
  • S Hooks (9)
  • U bolt
  • Chains-3ft. (4)
  • Ladder
  • Dowel Rods (3/4", 3/8", 1/4", 1/8")
  • Bucket
  • Trowel
  • Sandbag

Bibliography

  • "Tensile Strength." ScienceDaily. ScienceDaily, n.d. Web. 02 Apr. 2015.
  • "Tensile Strength | Physics." Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. 02 Apr. 2015.
  • http://simple.wikipedia.org/wiki/Stress_%28mechanics%29

Measuring the Tensile Strength of Wood

Background Research

Problem Statement

  • Tensile Stress- The amount of stress an object can withstand before breaking
  • Tensile Strength-The measure of how much tensile stress an object can be subjected to before breaking
  • Measured in psi
  • "When stresses less than the tensile strength are removed, a material returns either completely or partially to its original shape and size."
  • Stress = σ = Force/Area

How does the diameter of individual rods within a consistent group diameter affect the amount of weight the group can hold.

Formal Hypothesis

If the diameter of the individual rods in a group is related to the amount of weight the group can support, then the thicker the diameter of the individual rod the more weight the group of rods will support.

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