I don't know why the second picture is so small, but this is the jar after dropped! So for our design, Sandra and I had a large jar which was under 35 cm tall (the limit) and had stuffed it with padding. The bottom had about 2 full sheets of folded newspaper then onto of that about 5 inches of shredded paper. We then pushed down on it and started layering the shredded paper around the jar creating a small whole in the middle. On top of the shredded paper, we laid cotton balls for cushion. We then left it until we were given the egg. Once we were able to insert it, we surrounded cotton balls and wrapped it in newspaper. We then padded it at the top with about 5 more inches of cotton balls. After we put the lid on and hoped for the best!
A picture of the design
When we weighed our contraption, it was about 410 grams. Ours was dropped first and the result? Disaster! The lid was the heaviest and most massive item, pulling it down top-first. Upon realizing this, it was too late. This was surprising because we had planned for it to fall straight down with the bottom hitting ground first since that was where most of the padding was. Our plan was to increase impact time and decrease force using all the cushion. It was dropped from a height of about 10 m and had a velocity of about 10m/s in the air and a final velocity of 0m/s because of the ground causing it to stop. When it hit the floor, the lid cracked into about 4 pieces and flew around on the ground. It was an inelastic collision because the whole jar had bounced (pretty high!) on impact then fit the ground again. When i retrieved the jar and took out the cotton balls on the top, i noticed the newspaper around the egg was soaked.
I was surprised at how much force there was on the jar, and since the jar exerts the same amount of force as the ground exerts on the jar it was no wonder our egg cracked. Since the mass of the object was 410 grams, which is converted to 4.1 kg and the velocity was 10 m/s to find the moment we multiply mass (kg) x velocity (m/s) and get 4.1kg•m/s as our momentum. Either way, it was a fun lab to do and watch! :)
I'm sorry your project didn't work out okay. When it hit the ground with a "THUMP", we all gasped. We must have all felt just as bad as you =(
ReplyDeleteyour project seemed like it would be successful. That was a great idea to actually design your project before building it.
ReplyDeleteI like your drawing of the design for your egg capsule. I really thought it was going to work. Maybe all it needed was a little adjustment?
ReplyDeleteI liked your design! I thought that there was a pretty good chance the egg wouldn't break. Possibly the plastic was just too heavy? Either way, I the idea was real nice :)
ReplyDeleteI think it was just a little too heavy and the force was too much for the egg :/ but thanks guys! :)
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