How are $K$ (kinetic energy) and $U$ (potential energy) different?

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 water at the top of a waterfall falls to the bottom, what type of energy is the $\mathrm{kinetic}\mathrm{energy}$ of the water transformed into?

Which of the following is considered an efficient storage of energy?

How do an owl's wings inspire solutions to human engineering problems?

How are $K$ (kinetic energy) and $U$ (potential energy) related in a closed system?