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Breaking Board Paradox

Avg. Ratings: 2.5 (2 Reviews)
WARD470152-848
This simple, effective demonstration lets students discover for themselves the paradoxes of Newton’s first and second laws. A thin slab of white pine is set on a table so that a few inches hang over the edge. The board is then covered with a large sheet of paper that is subject to over 6000 kg of atmosphere because of its large surface area. When the overhanging portion of the board is hit sharply with the fist, it breaks easily. The other end of the board remains stationary, apparently held only by the sheet of paper. The kit contains instructions and materials for 10 demonstrations.

Note: Safety goggles should be worn and care should be taken to avoid flying pieces of wood when performing this experiment.



   
 

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470152-848 Breaking Board Paradox
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REVIEWS (2)

Total Ratings: 2
Avg. Ratings: 2.5 out of 5

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wardsci.com user education / teacher / texas
Yes, I recommend
Great for demo, but why isn't there a place to order refill pine pieces??? The paper doesn't wear out, but you soon run out of pine. Hmmmmmm.
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SARGENTWELCH.com associate Published 11/10/2016
Thank you for your feedback. We will definitely look into the suggestion of having replacement pine available to customers who have purchased the Breaking Board Paradox. Thank you for your review, your feedback is important to us.
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BruceYea Education / Teacher / Hershey PA
No, I didn't recommend
Interesting that I showed this to Science Kit and Boreal lab. twenty years ago and you still don't have it right. Recently I had a friend use your kit here and the wood flew halfway across the room so I thought I'd make the suggestion again. You'll find that this demonstration works much better with wider boards. The resistance to the board is pretty much just the air pressure against the board itself, the purpose of the paper is to keep air from getting under the board, while the wider board is slightly harder to break, the resistance against the wider board is increased dramatically with the increase in surface area, which why wider boards work better than the narrow boards that you have as part of the kit. I show the difference in this video: https://www.youtube.com/watch?v=kRR0CluqaX4
Reply
SARGENTWELCH.com associate Published 10/05/2016
Thank you for your review. The intent with our Breaking Board Paradox is to use the same type of wood on both sides and create a dramatic break when the pressure is applied. Please remember to have the students wear safety glasses in the classroom to prevent injury from the flying pieces. Thank you for your review, your feedback is important.
 
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