On Monday, we dissected cow eyes. I thought it was pretty gross, but some parts were interesting. It is best not to get into the details since, most people got sick (not literally) on seeing the dissection. Those who’d like to see the cow’s eye, here are a few pictures.
The rest of the week, we focused on motion and we did one experiment to help us learn. Then using the knowledge gained from the experiment, HW, and class work, we worked on a lab experiment.
The experiment involved two people and a compass.
Directions: Both people first faced north and pointed west. Then, we made our observation. Then, the two people faced each other (one person faced south and the other person faced north) and once again, pointed west. We made another observation to get an overall observation.Observation 1- for the first half of the experiment, both people pointed and faced the same way.
Observation 2- for the other half of the experiment, both people used different hands to point west (right hand or left hand, depending on where we were standing).
Final/ Concluding Observation- if located in a different position, we perceive right and left (direction) differently even though the compass indicated that the location of north, south, west, and east always remain the same.
What We Learned from Experiment: The compass directions remained the same, regardless of your orientation. However, the left and right directions changed based on your location/position. To keep the direction the same, we used a graph. On the x-axis, there was a positive and a negative and the same for the y-axis. As long as both people agree on which way positive and negative quadrants are, you’re fine.
The lab was designed to find the speed of a car. We had three options to test: if it accelerated, decelerated, or went at a constant rate.
Involved: A car, Steven was like a metronome by counting out every second, Andrew and I were the people who marked where the car was each sec, and Dan started the motorized toy car.
Hypothesis: Car will accelerate
Experiment: We put two yard sticks together. We put the front tip of the car at the zero mark of the first yardstick. When Steven said go, he started counting instantly, and Dan started the car. Andrew and I marked the distance per second on the scale according to Steven’s counting.
Prediction: Our prediction was that every second, the car would go farther per second, therefore going faster.
Result: The car’s speed did increase per second, proving that our hypothesis was true.
Assumptions: We assumed that Steven was counting properly, Andrew and I were marking accurately, and Dan started the car right away.
**We had to put all our data on a sheet given to us before, and answer some questions.
During the homework, we learned about dot diagrams. The farther apart the dots were, the faster the object was moving; the closer the dots were, the slower the object was moving. Simple!
Real Life Applications-
This method is used when plotting how fast a car goes (__mph) and in navigation. Positive or negative in x and/or y-axis are used to indicate direction.
On the draft, the pics were positioned differently but here it came messed up. Sorry
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