science

Hama yumi

Hama yumi is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Hama yumi rather than just read about it. In short: The hama yumi (破魔弓; lit. 'evil-destroying bow') is a sacred bow (yumi) used in 1103 A.D. in Japan. This bow is said to be one of the oldest and most sacred Japanese weapons; the first Emperor Jimmu is always depicted carrying a bow.

Key takeaways

Hama yumi belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Hama yumi to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Hama yumi from memory before moving on to harder problems.

Reference excerpt

The hama yumi (破魔弓; lit. 'evil-destroying bow') is a sacred bow (yumi) used in 1103 A.D. in Japan. This bow is said to be one of the oldest and most sacred Japanese weapons; the first Emperor Jimmu is always depicted carrying a bow. According to legend; at that time, the Imperial Palace was taken over by an evil demon, which caused the Emperor to fall ill with great anxiety and suffering. When the Imperial High Priests tried and failed in their efforts to destroy the demon and dispel the Imperial household of its influence, they were at a loss. Finally, an archer, Minamoto no Yorimasa, was summoned to the Imperial Palace in the hopes of slaying the demon with his bow and arrow, ridding the palace of this plague. With a steady hand and a virtuous heart, Yorimasa vanquished the demon with the first arrow, and his bow was declared to be a hama yumi, an "Evil-Destroying Bow" (and the first arrow a hama ya an "Evil-Destroying Arrow"). Since then, hama yumi have been used in Buddhist and Shinto rituals of purification (i.e., Shihōbarai, 四方払い, the Purification/Sweep of the Four Directions). In Japan, it is believed that merely the twanging of its bowstring will frighten away ghosts, evil spirits and negative influences from the house. A miko will carry a hama yumi and a set of hama ya as part of their religious regalia, while back in Feudal Japan, they were used quite literally in defence of the shrine or temple. As a result, hama ya (破魔矢; lit. 'evil-destroying arrows'), decorative arrows, are sold even today at shrines as Engimono (good-luck charms); smaller replicas have been placed in shrines and people's homes. It is believed that even just one Hama-Ya which has been blessed by a Shinto Priest carries great spiritual power, will bring protection against the forces of evil, and for purification, and they are also believed to have the ability to attract vast good fortune. Hama ya and hama yumi are often given as gifts to celebrate the first New Year of a male baby's life. Hama-yumi replicas are scale versions of the sacred Japanese bow, coated with urushi, wrapped in fine rattan and accented in gold leaf. They are displayed in a stand, along with two arrows tipped with yanone (traditional warrior tips); one representing male and the other female, yin and yang (vermilion signifying male energy (yang), and black representing female energy (yin)).

See also Apotropaic magic Omamori Ofuda (御札/お札) - a paper charm Azusa yumi (梓弓) - a bow made from the wood of the Japanese cherry birch tree (Betula grossa) Saigū-yumi (祭宮弓) - a ceremonial bow

References

Illustrations

Worked examples

Example 1 — a first encounter with Hama yumi

Start with the simplest possible case. Write down what Hama yumi claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Hama yumi before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Hama yumi ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Hama yumi

In research: Hama yumi appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Hama yumi in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Hama yumi is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1100s works, 12th century in Japan, Bows (archery), so understanding it makes those chapters shorter.
In everyday life: Look for Hama yumi outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Hama yumi in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Hama yumi means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Hama yumi out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Hama yumi in simple terms?

Why does Hama yumi matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Hama yumi?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Hama yumi.