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Lecture

# Living Earth Reflection Lab.docx

2 Pages
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School
Department
Earth & Environmental Sciences
Course
EESC 1180
Professor
Alan Kafka
Semester
Fall

Description
Reflection and What if Questions! 1. Given the balls of different mass which ball do you think was traveling the fastest (the lighter one or the heavier one). Remember the relationship between energy, velocity and mass for potential and kinetic energy. (hint: more kinetic energy means more velocity). The heavier ball was traveling faster than the lighter ball. In timing the balls, it took the heavier ball 3.27 seconds and the lighter ball 3.45 seconds to get to the to cup from the moment we let it go at the beginning of the rollercoaster. The average velocity of the heavier ball was 199.99 inches/second and the lighter ball had a velocity of 179.13 inches/second. Therefore, the heavier ball was clearly faster. Kinetic energy is defined as the energy of motion. The formula for kinetic energy is KE=0.5 mass * velocity2. The formula implies that a small change in speed causes a large change in Kinetic Energy and therefore the lighter ball has a lot less kinetic energy. Furthermore, more mass means more kinetic energy. On the other hand, potential energy depends on mass and height and more mass implies more potential energy. 2. Imagine that you could double the initial height of the first hill of your roller coaster. What would happen to the speed of the ball? Potential Energy is defined the energy of position, in other words, energy that is stored and held in readiness. Gravitational Potential Energy is basically the potential energy of an object thanks to the height it is positioned at. This is due to the gravity. Gravitational Potential Energy equals weight or mass of the object * height. Therefore, if the first hill of our roller coaster would be higher, the gravitational potential energy would be a lot higher and the ball would get faster and faster as it accelerated. Furthermore, while the ball is falling, the height gets smaller and smaller and therefore the ball loses potential energy and gains kinetic energy. It is important to note that energy is not created or destroyed, it is simply transformed and the loss of potential energy simply means that this energy will be transformed into another one. When the hill is higher, the impact of the ball against the bottom of it is stronger because the velocity was very high and potential energy is therefore lost an
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