Englishfor English speakers
physics
Noun
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Physics is the kind of science that is about how the world and universe work. Usually, physics is about things like movement, heat, light, sound, and electricity.
in
Preposition
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Used to show that something is inside something else.
The cat is in the box.
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Used to show that someone is at home, or is available.
Is John in?
The Doctor is now in.
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Used to show movement towards the inside.
The rain came in through the window.
the
Determiner
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Used, instead of a, to reference something specific, already known to exist.
Compare "I read a book." and "I read the book."
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Used with a stress, to show that the word following is special.
Are you the John Smith that I went to school with?
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Used with an adjective that acts like a noun to mean all of the people concerned
The poor are always with us.
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Used with superlatives forms of adjectives and adverbs.
You are the best.
classical
Adjective
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Classical ideas or styles are those that were very common at a time in the past and sometimes continue into the present.
Classical theories in physics can't explain certain observations, which has led scientists to come up with new theories.
limit
Noun
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The limit is the edge of how far something can go. It can go up to the limit but no farther.
This fence is at the limit of my property.
The heater sets a limit to how cold it can be in the house; it can't get colder than that.
There is no limit to what we can do.
limit
Verb
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To make something stay inside a limit.
The fence limits the cows from going out of the field.
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If you limit someone, you reduce or take away their freedom.