You throw a ball straight up into the air. What kinds of energy are changing as it goes up?A.Nuclear energy and sound energyB.Light energy and gravitational potential energyC.Gravitational potential energy and kinetic energyD.Kinetic energy and elastic energy
Question
You throw a ball straight up into the air. What kinds of energy are changing as it goes up?A.Nuclear energy and sound energyB.Light energy and gravitational potential energyC.Gravitational potential energy and kinetic energyD.Kinetic energy and elastic energy
Solution
The correct answer is C. Gravitational potential energy and kinetic energy.
Here's why:
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When you first throw the ball, it has a lot of kinetic energy (the energy of motion) and little gravitational potential energy.
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As the ball rises, it slows down, so its kinetic energy decreases.
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At the same time, as the ball gets higher, it's further from the Earth, so its gravitational potential energy increases.
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At the very top of the ball's path, it stops moving for an instant. At this point, it has no kinetic energy (because it's not moving), but it has a lot of gravitational potential energy (because it's high up).
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Then, as the ball falls back down, this process happens in reverse: the ball's gravitational potential energy decreases (because it's getting closer to the Earth), and its kinetic energy increases (because it's speeding up).
So, throughout this process, the types of energy that are changing are the ball's gravitational potential energy and kinetic energy.
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