Different types of energy: kinetic vs potential vs

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SUMMARY

The discussion clarifies the distinction between kinetic and potential energy using the example of a blackboard eraser held three feet above the ground. When the eraser is stationary, it possesses potential energy due to its height, while its kinetic energy is zero. The potential energy exists only when there is a height difference relative to a reference point, such as the floor. The conversation emphasizes that potential energy can convert into kinetic energy when the object is in motion.

PREREQUISITES
  • Understanding of basic physics concepts, specifically energy types.
  • Familiarity with potential energy and its dependence on height.
  • Knowledge of kinetic energy and its relation to motion.
  • Ability to apply energy concepts to real-world scenarios.
NEXT STEPS
  • Research the mathematical formulas for calculating potential energy (PE = mgh) and kinetic energy (KE = 1/2 mv²).
  • Explore the concept of gravitational potential energy in different contexts.
  • Investigate energy transformation processes in mechanical systems.
  • Learn about other forms of energy, such as thermal and chemical energy, and their applications.
USEFUL FOR

Students studying physics, educators teaching energy concepts, and anyone interested in understanding the fundamentals of energy types and their applications in real-world scenarios.

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1. Homework Statement

What type of energy does a blackboard eraser have when I hold it steady three feet about the ground?

a. potential energy
b. kinetic energy
c. electrical energy
d. spring elastic energy


I think it is kinetic energy. But I am confused on the differences of types of energies.
 
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Kinetic energy is what an object has when it is moving, so if you hold the eraser steady, it's kinetic energy will be equal to zero.

Think about what would happen if you let go of the eraser.
 
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Tell us what do you know about the 4 types of energies.
 
It's potential energy while it is still. and then kinetic if you start moving the eraser.
 
It's potential only if it has a relative height associated with it. For example, if the reference point is the floor and the eraser is held still on the floor then the kinetic energy is zero but the potential energy is also zero.

So being still is not itself the reason for something having potential energy. Think of potential energy as having the potential to transform into kinetic energy.
 

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