lab 2

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Apr 3, 2024

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CM-02- Moving Along Date 1/30/2024 Station:2 Instructor: Cuong Le Group: Shane Swanson(Scribe), Ethan Uphoff, Mostafa Al-Bayati Task 1: A. It moves forward at a constant velocity. It goes in a straight line but it was angled slightly off and went towards the sides of the paper. When it was picked up the wheels continued turning forward till it was switched to backwards. As it went in reverse it went at the same constant speed and still moved off the path of the paper because of where we placed it on the paper. B. L\ Displacement in cm Forwards Time in Seconds 0cm 0s 39.2cm 2s 75.5cm 4s 108cm 6s 140cm 8s 178.9cm 10s 195cm 12s 195cm 13s Displacement in cm Backwards Time in Seconds 195cm 14s 139cm 16s 84.5cm 18s 49.5cm 20s 16.9cm 22s 0cm 23.2s D. Slope forward equals 16.588 0 2 4 6 8 10 12 14 0 50 100 150 200 250 f(x) = 16.59 x + 5.7 Displacement Vs Time Foward Time in Seconds Displacement in cm
Slope in the air equal to zero 11.5 12 12.5 13 13.5 14 14.5 0 50 100 150 200 250 f(x) = 195 Displacement Vs Time In the air Time in Seconds Displacment in cm Slope backwards is -19.505 12 14 16 18 20 22 24 0 50 100 150 200 250 f(x) = − 19.51 x + 445.56 Displacement Vs Time Backwards Time in Seconds Displacement in cm E. The slopes are related to the toys because it is the displacement over time, which is speed. The equation of speed is displacement over time which is how we know. The sign of the slope shows which direction the car is going in relation to the starting point. F. The fastest speed that the car moved based off our data was between fourteen and sixteen seconds with a displacement of 56 cm. This will relate to a speed of 28cm/sec. It moved around 3cm/sec faster when going backwards based off our data. All the trucks did not show the same movement which is probably because of human error. Task 2: A. Sensor works correctly. B. It measures how long light waves take to return to the sensor after being sent out. C. We used a hand starting from the front of the sensor. Then we slowly moved the hand back away from the sensor until it read 1 meter away from the sensor. Then after that we marked the
point when the sensor read one meter and marked the paper accordingly. Then we measured to see how accurate it was. Our results were that it read 1.2 centimeters short of the meter stick. D. Done Task:3 A. B. Slope forwards is 0.184m/s or 18.4cm/s Slope backwards is -0.173m/s or -17.3cm/s Slope when in air is -0.0355m/s or -3.55cm/s When the truck was in the air our data shows it was 0cm/s the sensor showed that it had a slope of -3.55cm/s. It should be zero because the toy truck was not moving. When the truck was moving forward our data showed a slope of 16.58cm/s and the sensor showed that it had a slope of 18.4cm/s. Our slope data was slightly less but still pretty accurate likely to do with human error. When the truck was moving backwards our data showed a slope of -19.505cm/s and the sensor showed a slope of -17.3cm/s. Our slope was slightly more than the sensor. We think again this was due to human error.
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C. This velocity data is appropriate because when the car is moving forward it had a positive velocity and when the car was moving backwards it had a negative velocity. D. The mean velocity for forward was 0.18m/s or 18cm/s The mean velocity for backwards was -0.17m/s or -17cm/s The mean velocity for in the air was -0.04m/s or -4cm/s The forward slope was slightly more than the mean velocity. The forward slope was 18.4cm/s and the mean velocity was 18cm/s. This is a very close value. The backwards slope was slightly more than the mean velocity. The backward slope was - 17.3cm/s and the mean velocity was -17cm/s. This again is a very close value. The slope while in the air was slightly less than the mean velocity. The slope while in the air was -3.55cm/s and the mean velocity was -4cm/s. This value was still close but our least accurate value. E. The method that was most accurate is the determine the slope of the displacement graph. This is because it gives a more exact speed compared to using the average velocity and it’s much more accurate compared to calculating speed by hand. Wrap up. Accuracy: We could have been more accurate when calculating the speed by hand. It was hard to measure where the truck was at an exact point in time when it was moving. Additionally, the car tended to move to the edge of the table slightly which can change the accuracy and displacement of the car. Finally where we messed up with the sensor it should have been an exact zero but due to our error we measured the velocity to be -4cm/s.
Implications: The big idea is that we are relating time and displacement to find the velocity. Also, it is hard to find the exact velocity by hand and lasers are much more accurate and time efficient. This information can be used when calculating the speed of other objects and avoiding error. We also ffound that the slope of the displacement graph was the most accurate to determine the speed.

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