Vibration of an object about an equilibrium point is called simple harmonic motion when the restoring force is proportional to? a. time b. displacement c. a spring constant d. mass

B.displacement

Explanation:

A simple harmonic motion is a motion which describes a particle subdued to a restoring force proportional to its displacement.

The restoring force is directly proportional to the displacement and acts in the direction opposite to that of displacement.

A periodic motion is generated, this means that the motion is repeated every certain interval of time.

an ion is a charged atom or molecule. it is charged because the number of electrons do not equal the number of protons in the atom or molecule. an atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.

see earlier answer