Week 5 Science Methods 2

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  1. The big question addressed in the lab, and a description of what you did.
  2. A description of what you learned in Thursday's lecture.
  3. Answer questions about the weekly textbook reading:
    1. What did you learn?
    2. What was most helpful?
    3. What do you need more information on?
    4. What questions/concerns/comments do you have?   

    The question that we addressed in the lab was "How can we design a safe and durable playground surface?" Our challenge for this lab was to prevent an egg from breaking when dropped from a height of 1 meter. Our groups got to pick what materials we got to use. My group decided to use plastic wrap, sand, and straw. We started with the sand at the bottom of the bowl and then topped it with a heavier layer of straw. We then put the plastic wrap surrounding the top of the bowl. We then dropped the egg from 1 meter. The egg ended up bouncing out of the bowl and cracking. We looked at our video and noticed it hit a weird spot on the bowl too. We decided we needed to make it a little less bouncy. We ended up taking some of the straw out to make the impact a little deeper. We then decided to test it also from 2 feet. This time we were successful! The egg did not break  
    We did not have a lecture on Thursday. We had a test about all that we had learned these past 5 weeks. 
       Referring back to the readings we have done, what I related to this lesson/experiment was about the energy lens in motion. This is from the notes that I took: 
 Bounce: 

  • Energy transfers from the egg to the surface, then... 

  1. Surface compresses and springs back 

  2. Elastic deformation of the surface stores (potential) energy 

  3. Energy is transferred back to the egg as kinetic energy  

No bounce: 

  • Energy transfers from the egg to the surface, then… 

  1. Surface materials fly off and/or rub against each other 

  2. Energy remains on the surface as kinetic energy of objects/particles 

Energy does not transfer back to the egg 


 
  
 












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