What examples can be used to show that work and energy are physical quantities related to each other?

Work and energy are such physical quantities that are inextricably interconnected with each other and cannot exist without each other.

Any work can be done only with the use of energy. You can give a very simple example of human activity. A person cannot perform any business if he does not have the strength. When he eats food, he also receives energy with food, and a person can again perform any work, because now he has the necessary energy from food for this.

And vice versa: for example, mechanisms spend energy during some work.