EESC1180 Lecture Notes - Kinetic Energy, Centrifugal Force

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Reflection and what if questions: 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. 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.

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