Lupe and Lin are ice skating. The following sequence happens as shown in the diagram:Lupe slowly moves toward Lin as Lin stands still.Lupe gently bumps into Lin.Just after Lupe bumps into Lin, they both move in the same direction.Which statement best describes what happens? A. Lupe transfers kinetic energy to Lin. B. Lin loses kinetic energy after Lupe bumps into her. C. Lupe gains kinetic energy after she bumps into Lin. D. Lin transfers kinetic energy to Lupe.
Question
Lupe and Lin are ice skating. The following sequence happens as shown in the diagram:Lupe slowly moves toward Lin as Lin stands still.Lupe gently bumps into Lin.Just after Lupe bumps into Lin, they both move in the same direction.Which statement best describes what happens? A. Lupe transfers kinetic energy to Lin. B. Lin loses kinetic energy after Lupe bumps into her. C. Lupe gains kinetic energy after she bumps into Lin. D. Lin transfers kinetic energy to Lupe.
Solution
The best statement that describes what happens is A. Lupe transfers kinetic energy to Lin. Here's why:
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Initially, Lupe is moving while Lin is standing still. This means Lupe has kinetic energy (the energy of motion) while Lin does not.
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When Lupe bumps into Lin, some of Lupe's kinetic energy is transferred to Lin. This is based on the principle of conservation of energy which states that energy cannot be created or destroyed, only transferred or transformed.
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After the bump, they both move in the same direction. This indicates that Lin, who was initially stationary, has gained motion (and therefore kinetic energy) from Lupe.
So, the kinetic energy has been transferred from Lupe (who was moving) to Lin (who was stationary). Therefore, option A is the correct answer.
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