The illustration below represents a physics teacher doing a classroom demonstration. He pulls a pendulum made with a bowling ball toward his face until it touches his nose. Then he lets go of the ball.
Which of the following best explains why the bowling ball does not touch the teacher again as it swings?
Select one:
a The pendulum's kinetic energy gradually turns to potential energy
b. The penduluy's inertia acts in opposition to its potential energy
c. Some kinetic energy is lost due to air resistance and friction.
d.
A small amount of energy is lost due to gravity