In class today, we talked about the bicyclist worksheet and did an experiment to measure velocity, displacement, and test the graphs on the bicyclist worksheet. The class discussion began with asking which bicyclist was riding faster, A or B? A was the answer because it had a steeper slope comparative to B. The only thing that changed in the graph was the velocity of bicyclist A. Velocity is the speed and direction at which an object moves. In the first graph, bicyclist A was moving away from the reference point, while in the second graph, it was moving back towards the reference point. Somebody in my class identified the two graphs together as absolute value, but I still don't understand why it would be that.
Mr. Bataglia clarified some things and told us that if the line goes negative, it just means that it has passed the reference point. That helped explain my question on my previous entry. The second thing Mr. Bataglia told our class was change in position = displacement. So, if a I were to walk ten feet away from this computer and five feet back, my total distance would be fifteen feet, but my displacement from this computer would be five feet.
Next, we split up into our buses groups and did an experiment based off of what we recently learned. The groups used sonar machines that recorded your position by sending out sonars, computers to see the data, dora (Xplorer), and some wires. The first trial was not successful at all, because we were walking by it, not towards it. But the second trial worked out well. My partner walked way, then towards the sonar machine. The third time she walked at a faster speed making the graph steeper than the second trial. The interesting thing though was that the velocity did not change both times. That stumped my group. It was an interesting experiment. I'm glad our class is revisiting it on monday. Hopefully we'll get an answer about the velocity situation.
So in problem #2 bicyclist A was first going away from the reference point but in the second graph she was going towards the reference point. Did the slopes look the same steepness? I think the class agreed that they were? What does that mean for their speeds? What about the velocities? Would the answer be different if we are also discussing direction?
ReplyDeleteNice work. I definitely think you expressed your thoughts effectively and that's always good for answering personal questions and getting rid of doubts about data. Funny how you told me about improving my blog by expressing my opinions and thoughts. I think you could help me out in that aspect. I think what you could do to help show more of your confusion is to take pictures of your work, that way all of us who read your blog can see your problem areas. Also, I think you could elaborate more on the details and results of each experiment (and worksheet), just so it builds a bigger picture. Good work ^^
ReplyDeleteHey Damaris! Overall I think that your blog was very descriptive. If I didn't do the worksheet or the experiment at the end, I would understand the concept. But, there are some questions you could elaborate more on.If velocity is the speed and direction in which an object moves, then what is speed? What do you think was the reference point in the bicycle worksheet?I also agree with AJ- I feel like showing pictures of your work will help with your confusion. You could explain what's going on in the picture, as well as explaining what happened on the worksheet. If you could incorporate these questions into your blog, it would turn an already good blog, into a great blog! Nice job!!
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