Question

Because of friction

A) energy is NOT always conserved.
B) NOT all potential energy is converted to kinetic energy.
C) all of an object's kinetic energy turns into potential energy.
Eliminate
D) all of an object's potential energy turns into kinetic energy.

Answer 1

Because of friction , NOT all potential energy is converted to kinetic energy. (B)

Some of the object's potential energy is converted to heat and lost.