Types of energy

  • Thread starter csurfus1
  • Start date
  • #1
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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.
 

Answers and Replies

  • #2
907
88
Why do you think it has kinetic energy?
 
  • #3
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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