Hello 7th graders! I want to start the post with a picture of us today (because we were outside in the freezing cold).
Today we started the class with the checking of our homework. The homework was a sheet of paper with acceleration problems. A type of an acceleration problem (and the answer) would look like this:A cyclist began from a rest point at the top of the hill, then he starts downward and reaches the bottom with a speed of 50m/s in 20s. What was the acceleration of the cyclist? The problem would be solved like this:
Formula: acceleration = (Final velocity-Initial Velocity) /time
Plug: acceleration = (50m/s - 0m/s) / 20s
Chug: acceleration = 2.5 m/s/s or 2.5 mps 2(the two shows that "s" is squared)
or 2.5m/s 2(the two shows that "s" is squared)
After this we worked on a lab called Acceleration/Deceleration Testing". We first went outside into the main courtyard where we tested our capability of timing and the exactity of the timing. After several minutes of trying we were good enough. After this, we went outside and we arranged the whole class in a line at one meter intervals. There we each took our stopwatches and measured the exact time it took the ball to reach each one of us from the starting point. A very smart idea was using the gutter which had the sides tilted and that way the ball didn't follow another path. We measured 3 different kinds of balls, a ping pong ball, a tennis ball and a soccer ball. I, for example stayed at the four meters mark and collected the following data:
- ping pong ball: distance= 4 meters, time= 2.83 seconds, therefore speed= 1.41 mps
- tennis ball: distance= 4 meters, time=2.23 seconds, therefore speed=1.79 mps
- soccer ball: distance=4 meters, time =2.43 seconds, therefore speed=1.64 mps
For homework we reiceved the task of calculating the average speed of the time it took the three balls to reach us and also the speed of the three balls.
I also choose a movie about a peculiar Mr. Willard that might help you guys with the accleration problems. It's also kinda cool because it uses Ms. D's symbol for change (the triangle). These two movies were (in my opinion) clearl and understandable.
Before you comment look at the movies please
Next scribe is Alix
How do I get to the Movie.
ReplyDeleteWrite the next Scribe bigger.
Great job!!! I loved the pictures! But the spelling and grammar was a bit off....
ReplyDeleteAnd where are the movies?
Love the penguin Cip. Plus, aren't you excited that some other teacher besides me uses the same symbols. Hmmmmmm.....maybe that means it is used worldwide!!!! SWEET! Excellent observation and the videos are helpful as well - way to go!
ReplyDeleteI really liked your blog post, especially the freezing penguin! Maybe you could add a little more color to your writing and check your grammar!!!!!! All in all it is all very good(in my opinion)!
ReplyDeleteThe freezing penguin was great.
ReplyDeleteIn case any of you are bored by all of this speed, acceleration, deceleration and velocity, here is a wacky song about all of them called speed equals distance over time that goes to the tune of "Ain't no mountain high enough".
http://www.youtube.com/watch?v=AUkP8Ucy9Mg&feature=fvw
I thought the videos you poseted were helpful, and everything was awsome but a few spelling mistakes. I liked that you explained the homework and gave the answers to all of the questions. Nice job!
Good job, Cip, i loved the penguin and the other pictures. Both videos helped me a lot, thanks for adding them in the post... again, great job!
ReplyDelete