Grade 9 mathematics holliday home work

1) finish bridge lab repport (see previous post)
2) do exercises # 2, 3, 4 on pages 257 and 258 in «international maths 4»
3) prepare for a quiz on systems of equations on March 1 2010.

grade 9 pasta bridge report guide

Lab report Outline for bridge project:

Header and title

Hypothesis:

(Ex.: The chosen structure for this bridge is the best possible choice to obtain an efficient structure that will support a maximum of weight while being as light as possible.)

Material: -describe and justify the chosen design;
-describe the construction process;
-describe the material used for the construction;
-describe the material used to test the bridge.

Experimentation: -measure and record the weight of the bridge;
-describe (with diagram) the step by step process of
experimentation;
-Record the maximum weight supported by the structure;
-calculate the efficiency ratio.

Discussion: -Was the failure of my bridge a parts failure or a global structural
failure?
-How can I compare my bridge’s performance with the other bridges?
-Can I identify a structure defect in any of them?
-Could I improve my design or is it globally corrupt? Explain why.
-What would I chose as a structure if I was to compete again in a
bridge contest and why?

Conclusion: -did I demonstrate my hypothesis and why?

Annexes and Bibliography.