How are $\mathrm{potential energy}$ and $\mathrm{kinetic energy}$ related in a closed system?

What is the ultimate source of energy for most processes on $Earth$?

Which of the following devices is designed to convert energy into mechanical work?

How are $\mathrm{potential energy}$ and $\mathrm{kinetic energy}$ related in a closed system?

Which of the following scenarios best illustrates $\mathrm{kinetic} \mathrm{energy}$ in everyday life?

In the context of energy flow in a system, which of the following is typically the initial source of $E$?

Which of the following theories explains the formation of the universe?

When an object is in motion, what type of energy does it possess?