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physics

Jenga

Jenga 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 Jenga rather than just read about it. In short: Jenga is a game of physical skill created by British board game designer and author Leslie Scott and marketed by Hasbro. The name comes from the Swahili word "kujenga" which means 'to build or construct'.

Jenga — main illustration
Jenga — illustration

Key takeaways

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

Reference excerpt

Jenga is a game of physical skill created by British board game designer and author Leslie Scott and marketed by Hasbro. The name comes from the Swahili word "kujenga" which means 'to build or construct'. Players take turns removing one block at a time from a tower constructed of 54 blocks. Each block removed is then placed on top of the tower, creating a progressively more unstable structure. The game ends when the tower falls over.

History Jenga was created by Leslie Scott, the co-founder of Oxford Games Ltd, based on a game that evolved within her family in the early 1970s using children's wooden building blocks, which the family purchased from a sawmill in Takoradi, Ghana. The name Jenga is derived from kujenga, a Swahili word which means "to build". A British national, Scott was born in Tanganyika, now Tanzania, where she was raised speaking English and Swahili, before moving to live in Ghana, West Africa. Scott launched the game she named and trademarked as "Jenga" at the London Toy Fair in January 1983 and sold it through her own company, Leslie Scott Associates. The blocks of the first sets of Jenga were manufactured for Scott by the Camphill Village Trust in Botton, Yorkshire. The V&A Museum of Childhood has exhibited one of the original sets of Jenga since 1982. In 1984, Robert Grebler, an entrepreneur from California who was the brother of a close friend of Scott, contacted her and expressed interest in importing and distributing Jenga in Canada. In April 1985, Grebler acquired from Scott the exclusive rights to Jenga for the United States and Canada, and then in October of that year, Scott assigned the worldwide rights in Jenga to Grebler, which he in turn assigned to Pokonobe Associates. Convinced of Jenga's potential, Grebler had invited two cousins to form Pokonobe Associates with him in 1985 to increase distribution of Jenga. Pokonobe then licensed Irwin Toy to sell Jenga in Canada and to be master licensee worldwide. Pokonobe Associates takes 80% of royalties while Scott receives 20% or less, despite Scott having authored and published the game while Grebler effectively acted only as an agent, the reverse of the customary split; Scott says she "came to regret signing away my rights to Jenga on those terms." Irwin Toy licensed Jenga to Schaper in the United States, and when that company was bought by Hasbro, Jenga was launched under the Milton Bradley banner in 1987. Eventually, Hasbro became licensee in most countries around the world. By 2019, according to Pokonobe Associates, owners of the Jenga brand, over 80 million Jenga games, equivalent to more than 4.3 billion Jenga blocks, had been sold worldwide. On November 5, 2020, Jenga was inducted into the National Toy Hall of Fame.

Rules

Jenga is played with 54 wooden blocks. Each block is three times as long as it is wide, and one fifth as thick as its length – 1.5 cm × 2.5 cm × 7.5 cm (0.59 in × 0.98 in × 2.95 in). Blocks have small, random variations from these dimensions so as to create imperfections in the stacking process and make the game more challenging. To begin the game, the blocks are stacked into a solid rectangular tower of 18 layers, with three blocks per layer. The blocks within each layer are oriented in the same direction, with their long sides touching, and are perpendicular to the ones in the layer immediately below. A plastic tray provided with the game can be used to assist in setup. Starting with the one who built the tower, players take turns removing one block from any level below the highest completed one and placing it horizontally atop the tower, perpendicular to any blocks on which it is to rest. Each player may use only one hand to touch the tower or move a block at any given time, but may switch hands whenever desired. Once a level contains three blocks, it is complete and may not have any more blocks added to it. A block may be touched or nudged to determine whether it is loose enough to remove without disturbing the rest of the tower, but it must be returned to its original position if the player decides to move a different one. A turn ends when the next player in sequence touches the tower or when 10 seconds have elapsed since the placement of a block, whichever occurs first. The game ends when any portion of the tower collapses, caused by either the removal of a block or its new placement. The last player to complete a turn before the collapse is the winner.

Tallest tower The packaging copy of one edition of the Jenga game claims that Robert Grebler may have built the tallest Jenga tower ever at 402⁄3 levels. Grebler built the tower in 1985 while playing with an original Jenga set produced by Leslie Scott in the early 1980s.

Official variants

Throw 'n Go Jenga is a variant originally marketed by Hasbro. It consists of blocks that are in various colors plus a six-sided die. It is marketed by Art's Ideas. Jenga Truth or Dare was a variation of Jenga also marketed by Hasbro. This version looked like regular Jenga except there were three colors of blocks instead of just the natural color of Jenga. Jenga Xtreme used parallelogram-shaped blocks that could create some interesting leaning towers. Casino Jenga: Las Vegas Edition employed roulette-style game play, featuring a felt game board, betting chips, and additional rules. In addition, there have been a number of collector edition Jenga games, featuring the colors and logos of the Boston Red Sox, Las Vegas Raiders, New York Yankees, and John Deere, among others. Hello Kitty Jenga, Transformers Jenga, Tarzan Jenga, Tim Burton's The Nightmare Before Christmas Jenga, Donkey Kong Jenga, Bob's Burgers Jenga, National Parks Jenga, Jenga Ocean, The Walking Dead Jenga, Super Mario Jenga, Fortnite Jenga, Godzilla Jenga, Rick and Morty Jenga, Onyx Jenga, and Harry Potter Jenga are some of the licensed variations of Jenga.

… excerpt ends here. Continue reading the full article.

Illustrations

Jenga illustration
Jenga illustration
Jenga: A Jenga tower collapses
A Jenga tower collapses
Jenga illustration
Jenga illustration

Worked examples

Example 1 — a first encounter with Jenga

Start with the simplest possible case. Write down what Jenga 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 Jenga 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 Jenga 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 Jenga

In research
Jenga 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 Jenga 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
Jenga is common in secondary-school and first-year university syllabi. It links to neighbouring topics British inventions, Combinatorial game theory, Games and sports introduced in 1983, so understanding it makes those chapters shorter.
In everyday life
Look for Jenga 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 Jenga in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Jenga 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 Jenga out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Jenga in simple terms?

Jenga is a game of physical skill created by British board game designer and author Leslie Scott and marketed by Hasbro. The name comes from the Swahili word "kujenga" which means 'to build or construct'.

Why does Jenga 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 Jenga?

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 Jenga.

Tags

  • British inventions
  • Combinatorial game theory
  • Games and sports introduced in 1983
  • Games of physical skill
  • Milton Bradley Company games
  • Party games
  • Swahili words and phrases

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