Why the Heavy Door Closes Gently
Written by Studio AM.
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A heavy public door may swing open easily and then close without slamming. The small box above it is a door closer. Inside, a spring and a chamber of oil work together.
When you pull the door open, an arm turns a shaft and squeezes the spring. The spring stores energy. Once you let go, that energy pushes the door back toward its frame. A spring alone would move too quickly. Instead of letting it snap shut, the closer forces oil through a narrow valve. The restricted flow slows the arm and controls the door's speed.
Near the end of the swing, a separate adjustment may let the door move firmly enough to reach the latch. The settings must balance several needs. The door should give a person time to pass, resist a hard slam, and still close fully. A trained maintainer can adjust some closers for the door and setting. This quiet mechanism turns one pull into a controlled return, helping a shared entrance work again and again.
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Questions
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Question 1 of 4
What is the passage mainly explaining?
The answer is D: How a spring, oil, and adjustments make a door return at a controlled speed
The passage follows energy into the spring, oil through the valve, and the final adjustment to explain one controlled closing cycle.
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Question 2 of 4
Why does the closer force oil through a narrow valve?
The answer is A: The resistance slows the spring's return so the door does not snap shut.
The text contrasts the fast motion of a spring alone with restricted oil flow, which slows the arm and controls speed.
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Question 3 of 4
What is the “latch” in this passage?
The answer is B: The part that catches and holds the closed door
The door must move firmly enough to reach the latch and close fully, identifying the latch as the part that catches the door.
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Question 4 of 4
Which part stores energy when the door opens?
The answer is C: The spring
The second paragraph directly states that opening the door squeezes the spring and that the spring stores energy.
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