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physics

Scissors

Scissors is a physics 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 Scissors rather than just read about it. In short: Scissors or shears are hand-operated cutting tools that consists of a pair of pivoting blades whose sharpened edges slide firmly against and past each other when the handles (shank) on the opposite side of the pivot are squeezed shut, causing the target material in between the blades to be divided by the combined effort of both cutting and shearing. Scissors are usually used for cutting thin materials such as paper…

Scissors — main illustration
Scissors — illustration

Key takeaways

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

Reference excerpt

Scissors or shears are hand-operated cutting tools that consists of a pair of pivoting blades whose sharpened edges slide firmly against and past each other when the handles (shank) on the opposite side of the pivot are squeezed shut, causing the target material in between the blades to be divided by the combined effort of both cutting and shearing. Scissors are usually used for cutting thin materials such as paper, cardboard, metal foil, cloth, rope and wire, although a large variety of scissors/shears exist for specialized purposes, and their design details often dictate which is best for the intended job. While all scissors largely follow the same working principle, heavy-duty scissors intended for cutting tough materials tend to be called shears instead of scissors (e.g. pruning shears and grass shears), and some larger, two-handed implements are called trimmers instead (e.g. hedge trimmer). Choosing the optimal type of scissors/shears is crucial, as otherwise it can cause unwanted damage to the target material and/or the instrument itself. For example, hair-cutting shears and kitchen shears are functionally equivalent scissors, but hair-cutting shears have specific blade angles ideal for cutting heaped bundles of hair, and using the incorrect type of scissors will result in increased damage or split ends, or both, by breaking the hair; kitchen shears, also known as kitchen scissors, are intended for cutting and trimming tough food materials such as meat, tendon and bones. Surgical scissors, used to divide tissues and trim/reshape implants during surgical operations, have even a greater variety to deal with different anatomical and procedural circumstances. Most scissors have a ringed handle to allow readily opening for repeated cutting, and some even have spring between the shanks to assist opening (especially for shears with straight handle). While historically inexpensive, mass-produced scissors often have bare metal handles, modern scissors are often designed ergonomically with composite thermoplastic and rubber covering on handles, which are more comfortable for the hand.

Terminology The noun scissors is treated as a plural noun and therefore takes a plural verb (e.g., these scissors are). Alternatively, the tool is referred to by the singular phrase a pair of scissors. The word shears is used to describe similar instruments that are larger in size and for heavier cutting.

History

Early manufacture The Hangzhou Zhang Xiaoquan Company in Hangzhou, China, has been manufacturing scissors since 1663. Pivoted scissors were not manufactured in large numbers until 1761, when Robert Hinchliffe of Sheffield produced the first pair of modern-day scissors made of hardened and polished cast steel. His major challenge was to form the bows; first, he made them solid, then drilled a hole, and then filed away metal to make this large enough to admit the user's fingers. This process was laborious, and apparently Hinchliffe improved upon it in order to increase production. Hinchliffe lived in Cheney Square (now the site of Sheffield Town Hall), and set up a sign identifying himself as a "fine scissor manufacturer". He achieved strong sales in London and elsewhere.

Modern manufacturing regions

China The vast majority of global scissor manufacturing takes place in China. As of 2019, China was responsible for 64.3% of worldwide scissors exports. When combined with Chinese Taipei exports, this rises to 68.3%. The Hangzhou Zhang Xiaoquan Company, founded in 1663, is one of the oldest continuously operating scissor manufacturers in the world. The company was nationalized in 1958 and now employs 1500 people who annually mass-produce an estimated seven million pairs of inexpensive scissors that retail for an average of US$4 each.

France In the late 14th century, the English word "scissors" came into usage. It was derived from the Old French word cisoires, which referred to shears. There are several historically important scissor-producing regions in France: Haute-Marne in Nogent-en Bassigny, Châtellereault, Thiers and Rouen. These towns, like many other scissor-producing communities, began with sabre, sword and bayonet production, which transitioned to scissors and other blades in the late 18th and early 19th centuries. Thiers, in the Puy-de-Dôme department of Auvergne, remains an important centre of scissor and cutlery production. It is home to both the Musée de la Coutellerie, which showcases the town's 800-year history of blade-making, as well as Coutellia, an industry tradeshow that advertises itself as one of the largest annual gatherings of artisanal blade-makers in the world.

Germany Germany was responsible for manufacturing just under 7% of global scissors exports in 2019. Often called "The City of Blades", Solingen, in North Rhine-Westphalia, has been a center for the manufacturing of scissors since medieval times. At the end of the 18th century it's estimated that there were over 300 scissorsmiths in Solingen. In 1995 the City of Solingen passed The Solingen Ordinance, an update to a 1930s law that decreed "Made in Solingen" stamps could only be applied to products almost entirely manufactured in the old industrial area of Solingen. In 2019 this applied to approximately 150 companies making high-quality blades of all kinds, including scissors. Friedrich Herder, founded in Solingen in 1727, is one of the oldest scissors manufacturers still operating in Germany.

Italy

Premana, in Lecco Province, has its origins in ironworks and knife manufacturing beginning in the 16th century. In 1900 there were ten scissor manufacturing workshops, 20 in 1952 and 48 by 1960. Today, Consorzio Premax, an industrial partnership, organizes over 60 local companies involved in the manufacture of scissors for global markets. In 2019 Italy exported 3.5% of scissors manufactured globally. One of the oldest Premanese scissor manufacturing firms still in operation is Sanelli Ambrogio, which was founded in 1869.

… excerpt ends here. Continue reading the full article.

Illustrations

Scissors: A pair of standard scissors
A pair of standard scissors
Scissors: Han dynasty scissors
Han dynasty scissors
Scissors: These shears are thought to date to the 2nd century AD and come from a Roman settlement in Trabzon, Turkey. The style of the "Egyptianizing" metal inlay designs suggests that they were made to imitate actual Egyptian art. When closed, the dog and cat figures at the tips come face to face.[4]
These shears are thought to date to the 2nd century AD and come from a Roman settlement in Trabzon, Turkey. The style of the "Egyptianizing" metal inlay designs suggests that they were made to imitate actual Egyptian art. When closed, the dog and cat figures at the tips come face to face.[4]
Scissors: Classic Italian-style kitchen scissors, often used to cut food. The two halves can be detached in order to be cleaned.
Classic Italian-style kitchen scissors, often used to cut food. The two halves can be detached in order to be cleaned.
Scissors: Left-handed (left) and right-handed (right) sidebent scissors
Left-handed (left) and right-handed (right) sidebent scissors

Worked examples

Example 1 — a first encounter with Scissors

Start with the simplest possible case. Write down what Scissors claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In physics, 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 Scissors 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 Scissors 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 Scissors

In research
Scissors appears in physics 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 Scissors 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
Scissors is common in secondary-school and first-year university syllabi. It links to neighbouring topics Embroidery equipment, Mechanical hand tools, Scissors, so understanding it makes those chapters shorter.
In everyday life
Look for Scissors 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 Scissors in 20 minutes

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

Frequently asked questions

What is Scissors in simple terms?

Scissors or shears are hand-operated cutting tools that consists of a pair of pivoting blades whose sharpened edges slide firmly against and past each other when the handles (shank) on the opposite side of the pivot are squeezed shut, causing the target material in between the blades to be divided…

Why does Scissors matter?

Because it connects several physics 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 Scissors?

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 Scissors.

Tags

  • Embroidery equipment
  • Mechanical hand tools
  • Scissors
  • Sewing equipment

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