What Type of Energy Does a Blackboard Eraser Have?

AI Thread Summary
A blackboard eraser held three feet above the ground primarily has potential energy due to its elevated position. This potential energy is a result of the work done in lifting it, described by the equation P.E = mgh. The eraser does not possess kinetic energy while held steady, as it is not in motion. Once released, the stored potential energy will convert to kinetic energy as it falls. Understanding the distinction between potential and kinetic energy is crucial in this context.
csurfus1
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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

Homework Equations



none.

The Attempt at a Solution



I think it is kinetic energy. But I am confused on the differences of types of energies.
 
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Why do you think it has kinetic energy?
 
Potential Energy (Gravitational potential energy)
It does not have Kinetic energy because it is not in motion in your frame. (K.E = 1/2mv^2)

It does have Potential energy since you have done work (put energy into the system) in lifting the eraser up. That energy is stored as potential energy P.E = mgh ready to be released as kinetic as soon as you let the eraser go.
 
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