This week in science we continued with kinematics. In lesson 12.2 there is a graph showing the motion of a car. In part of the graph there was a flat line and the position and the time were showed on the sides. It said the position of the car was staying the same but the time was getting longer. I learned that if there is ever a flat line, that means whatever the graph is representing has stopped. In the next graph the line is going up and then going down. From this graph I learned that the whatever the graph is representing has sped up and then slowed down.

In lesson 11.7 there was a question that asked how long a line would be if 10 billion people lined up shoulder to shoulder. Then there was another question that asked if the earth could be considered a particle compared to this line. I think the earth could be considered a partical if everyone lined up because the line would be a lot longer then the earth is wide. Then the next question was about how pecise them measurements are. What I learned from these questions is that the calculations will always be a little bit off because you can't get the exact measurement of something.

This week in science we did a series of worksheets. The worksheets helped us learn about the motion of objects. We learned that a trend line is a line on a graoh that represents the average of two sets of datda. On the worksheet 7.1 we had to find the rate that a slow car traveled and the rate a fast car traveled. Then we had out if the two speeds were consant. We got a slow car and measured out a meter. Someone from out group was the time keeper and said when every second passed while someone else made a mark at the front of the car where it was at the second. We did the same thing with a fast car. At the end of the test we mearued between the marks. We looked at the slow car first. The marks were differrent distances apart but were relatively close together. The marks were within 5 centimeters apart so the car didn't move at an exact rate but it moved at an almost constant rate.

When we looked at the results we also realized that the slow car went faster in the first second then the fast car. The second second the same thing happened but then in the third second the fast car sped up and went faster then then slow car.

This week in science we did an experiment with toy cars to see if they stayed at a constant speed or if they sped up or slowed down. We marked off every 10 centimeters on the floor and started the car off at a starting line near the begining of the marks. Someone acted as a metronome and told the other people in the group when every second passed. We started the car and when a second passed someone marked off where the car was. When the car went far enough we stopped it and looked at the marks on the floor. The marks were different distances apart but generally the same. We came to the conclusion that the car was moving at a constant rate. It didn't speed up or slow down.