10. Conservation of Energy

When a roller coaster car moves down from the top of a hill, which of the following best describes the energy transformation that occurs in the system?

Which of the following statements about the energy of a pendulum is true?

In a system where a particle moves along a frictionless track and its potential energy as a function of position is shown in the graph below, at which point on the graph does the particle have its maximum kinetic energy?

At equilibrium in a pendulum, the potential energy is $0$ and the velocity is ________.