September 24 (Tuesday) Law of Falling Bodies
If you were gone today: We collected the BIG 40 pts. takehome lab GRAPH YOUR ROUTE
but nothing else was turned in. Read the information below, especially the BIG PICTURE comments.
Took pictures of superheroes each period for homecoming
period 1
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period 3
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period 4
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period 7
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Showed my daughter Sky Diving over an island (DUNK ISLAND) in Australia.
From the video you learned that the worse part of skydiving is when your parachute opens because you go from about 122 MPH down to about 2 MPH in a short period of time. Alissa said that you only loose your stomach for a fraction of a second when you first jump out of the airplane, after that it is just enjoying the scenery.
Problem Sheet Work Done by Student Groups today
period 1 period 3 period 4 period 7
Law of Falling Bodies
A professional video explained two main ideas:
1. They pointed out Galileo's thought experiment that lead him to the conclusion that all objects (regardless of mass) fall at the same rate IN A VACUUM!
The Thought Experiment: What is you hooked a skydiver to a large car and dropped them from an airplane so that the person was falling from above the large car but a rope was attached to each. If the person falls slower than the car it would slow the fall of the car up and the two together would fall slower....But if the two together have more mass then they should fall faster together...Both cannot happen...thus they must fall at the same rate in a vacuum (no air, only gravity; like the Moon).
2. They showed how Galileo figured out the Law of Falling Bodies. That is our fab five #4, that basically says that the distance an object falls, in uniform acceleration (like gravity), is directly proportional to the time squared.
Thus in one unit of time it falls 1 (because of 1 squared) and in two units of time 4 (because 2 squared is 4) and then 9, 16, 25, .... Now if you take the difference of the perfect squares it shows how far consecutive washers need to be apart on a dropped string so they hit with equal times between hits. 1-0 = 0; 4-1=3; 9-4=5; 16-9=7; 25-16=9..... Thus if the first two objects are tied 7 cm apart, the next washer would be 3 times 7 or 21 cm apart, the next 5 times 7 or 35 cm and then 49 cm and then 63 cm....etc. Now when dropped will will hear them with the same time between consecutive hits.
1. They pointed out Galileo's thought experiment that lead him to the conclusion that all objects (regardless of mass) fall at the same rate IN A VACUUM!
The Thought Experiment: What is you hooked a skydiver to a large car and dropped them from an airplane so that the person was falling from above the large car but a rope was attached to each. If the person falls slower than the car it would slow the fall of the car up and the two together would fall slower....But if the two together have more mass then they should fall faster together...Both cannot happen...thus they must fall at the same rate in a vacuum (no air, only gravity; like the Moon).
2. They showed how Galileo figured out the Law of Falling Bodies. That is our fab five #4, that basically says that the distance an object falls, in uniform acceleration (like gravity), is directly proportional to the time squared.
Thus in one unit of time it falls 1 (because of 1 squared) and in two units of time 4 (because 2 squared is 4) and then 9, 16, 25, .... Now if you take the difference of the perfect squares it shows how far consecutive washers need to be apart on a dropped string so they hit with equal times between hits. 1-0 = 0; 4-1=3; 9-4=5; 16-9=7; 25-16=9..... Thus if the first two objects are tied 7 cm apart, the next washer would be 3 times 7 or 21 cm apart, the next 5 times 7 or 35 cm and then 49 cm and then 63 cm....etc. Now when dropped will will hear them with the same time between consecutive hits.
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