Work & Power

About the Book

In the prehistoric Valley of Stones, the mighty Ogg and the clever inventor Zala discover the everyday rules of physics. When Ogg pushes a mossy boulder with all his strength and it does not move, the story explains that no work was done; when the boulder finally slides, the book reveals that work depends on force multiplied by distance. Zala then moves her own boulder faster using rollers, and the two friends compare why speed makes power different from work.

Prerequisite Requirements

No formal preparation is needed. A child will enjoy this book if they can follow a simple illustrated story and already notice differences between pushing, pulling, fast, and slow. No familiarity with physics is expected.

Learning Benefits

The book gives young readers a clear, story-based boundary between trying hard and actually doing work, while introducing two measurable ideas: force times distance, and how quickly that work happens. It creates natural moments to compare strength with speed and to spot simple tools like rollers in the world around us.

Structured Knowledge Path

This story sits at the early meeting point between everyday action and formal physics. It starts with the familiar push of hands and then defines work as force multiplied by distance, before treating power as how fast that work is done. Neighboring ideas include motion, energy, speed, and simple tools, all of which appear in Ogg and Zala's valley.

Advancement

Later, a reader can build on these ideas by learning to measure distance and time, to express work in joules, and to compare how quickly different machines perform the same task. The habit of checking whether something really moved before calling it work transfers to thoughtful observation in science and daily life.

Knowledge Points

• Work happens only when a sustained push or pull actually moves an object.
• When a push powers a movement, the total work is the force multiplied by the distance.
• Lifting is also a form of work because it moves an object against gravity.
• Doing the same work in a shorter time uses more power.
• Simple tools such as a roller can make a heavy object easier or faster to move.

Skills

• define-power-as-rate-of-work
• define-work-as-force-times-distance
• recognize-lifting-as-work
• use-tools-to-move-work-faster

Vocabulary

Work

The energy used when a force and force force objects a moving object over a distance, calculated as Work = Force × Distance.

Force

A push or pull that can make an object move.

Distance

How far an object travels when a force is applied.

Power

The rate at which work is done; doing a large amount of work in a short time means more power.

Joule

The unit of measurement for work and energy.

Roller

A round log or similar object placed under a heavy load so it can roll more easily, as Zala uses to move her boulder faster.

Reading Guidance for Teachers and Guardians

• Page 4: Pause at the mossy boulder and ask the child what could happen if Ogg pushes it, then look carefully at his patient eager expression.
• Page 5: The boulder stays still even though are in strong. Note the phrase zero Work and ask what the difference might be between trying hard and actually moving an object.
• Page 7: Read the formula Work = Force × Distance with the child, then ask what would happen to the work if distance was doubled.
• Page 9: Look at Zala placing hair boulder on rollers and compare it with Ogg's slow all-morning afternoon; ask which one did the same work but used more power.
• Page 10: Between pages 9 and 11, compare the characters' stories so the child can explain why Zala's faster result means more power.