Discuss the differences between equilibrium, stable equilibrium, ...

[corkyiscool3328]

Discuss the differences between equilibrium, stable equilibrium, unstable equilibrium, and neutral equilibrium. Include references to potential energy diagrams in your discussion.
 
  What will be an ideal response?

Question 2

A non-uniform, 80-g, meter stick balances when the support is placed at the 51.0-cm mark. At what location on the stick should a 5.0-g tack be placed so that the stick will balance at the 50.0 cm mark?
 
  A)
 
  16.0 cm
 
  B)
 
  67.0 cm
 
  C)
 
  66.0 cm
 
  D)
 
  35.0 cm
 
  E)
 
  34.0 cm

[Ksh22]

Answer to Question 1

If an an object is in equilibrium, this simply means that the net force on the object is zero. Hence, its acceleration is zero.
An object that returns toward its equilibrium point when displaced slightly is said to be at a point of stable equilibrium. Any minimum in the potential energy curve represents a point of stable equilibrium.
An object that will not return to its equilibrium point when slightly displaced, but instead moves farther away is said to be at a point of unstable equilibrium. Any maximum in the potential energy curve represents a point of unstable equilibrium.
When an object is in a region over which the potential energy is constant, the force is zero over some distance. The object is in equilibrium and if displaced slightly to one side the force is still zero. The object is said to be in neutral equilibrium in this region.

Answer to Question 2

E

[corkyiscool3328]

TYSM

[matt95]

Excellent