physics

Vigipirate

Vigipirate 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 Vigipirate rather than just read about it. In short: Vigipirate (French: Plan Vigipirate [vi.ʒi.pi.ʁat]) is France's national security alert system. Created in 1978 through interministerial sessions and falling within the responsibilities of the prime minister, it has since been updated three times: in 1995 (following a terror bombing campaign), 2000 and 2004.

Key takeaways

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

Reference excerpt

Vigipirate (French: Plan Vigipirate [vi.ʒi.pi.ʁat]) is France's national security alert system. Created in 1978 through interministerial sessions and falling within the responsibilities of the prime minister, it has since been updated three times: in 1995 (following a terror bombing campaign), 2000 and 2004.

Details Until 2014 the system defined four levels of threats represented by five colors: white, yellow, orange, red, scarlet. The levels called for specific security measures, including increased police or police/military mixed patrols in subways, train stations and other vulnerable locations. In February 2014 the levels were simplified to 'vigilance' (or surveillance) and 'attack alert'. In December 2016, they were reorganized in three levels: 'vigilance', 'heightened security/risk of attack' and 'attack emergency'. The name "Vigipirate" is an acronym of vigilance et protection des installations contre les risques d'attentats terroristes à l'explosif (lit. 'surveillance and protection of facilities against the risk of terrorist bombing attacks').

Levels of alert (to 2014)

Levels of alert (2014-2016)

Levels of alert (from 2016)

History of alert levels

Illustrations

Vigipirate logo of the ongoing Opération Sentinelle

Worked examples

Example 1 — a first encounter with Vigipirate

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

In research: Vigipirate 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 Vigipirate 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: Vigipirate is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1978 introductions, Alert measurement systems, Emergency management in France, so understanding it makes those chapters shorter.
In everyday life: Look for Vigipirate 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 Vigipirate in 20 minutes

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

Frequently asked questions

What is Vigipirate in simple terms?

Why does Vigipirate 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 Vigipirate?

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 Vigipirate.