Multiple Choice
Which of the following is considered an efficient storage of energy?
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9. Work & Energy
Intro to Energy & Kinetic Energy
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How is potential energy related to kinetic energy in a closed system?
A
Potential energy and kinetic energy are always equal.
B
Potential energy is unrelated to kinetic energy.
C
Potential energy can be converted into kinetic energy and vice versa.
D
Potential energy is always greater than kinetic energy.
Verified step by step guidance1
Begin by understanding the concept of energy conservation in a closed system. In physics, a closed system is one where no energy is lost to the surroundings, meaning the total energy remains constant.
Recognize the two main types of mechanical energy: potential energy and kinetic energy. Potential energy is the energy stored due to an object's position or configuration, while kinetic energy is the energy of motion.
Understand the principle of energy conversion. In a closed system, potential energy can be converted into kinetic energy and vice versa. This is a fundamental concept in physics known as the conservation of mechanical energy.
Consider an example, such as a pendulum. At its highest point, the pendulum has maximum potential energy and minimum kinetic energy. As it swings down, potential energy is converted into kinetic energy, reaching maximum kinetic energy at the lowest point.
Use the equation for mechanical energy conservation: . This equation shows that the sum of potential and kinetic energy remains constant in a closed system.
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