Definition

1. Noun:
   • Pulley: A simple machine consisting of a wheel with a grooved rim around which a rope, chain, or belt passes. It is used to change the direction of a force or to transmit power in mechanical systems.

Usage Examples

• Noun:
  • Cần một pu-li để nâng vật nặng này lên. (A pulley is needed to lift this heavy object.)
  • Hệ thống dây cua-roa và pu-li bị mòn. (The system of belts and pulleys is worn out.)
  • Pu-li trên động cơ quay rất nhanh. (The pulley on the engine spins very fast.)

Advanced Usage

• In mechanical and engineering contexts, "pu-li" is a technical term for the component. It is often part of a larger system involving belts or ropes.
  • Thiết kế phải tính toán đường kính pu-li chính xác. (The design must calculate the pulley diameter accurately.)

Variants and Related Words

• Ròng rọc: This is the more common, general Vietnamese term for "pulley." "Pu-li" is a direct loanword used primarily in technical fields.
  • Học sinh học về nguyên lý của ròng rọc. (Students learn about the principle of the pulley.)

Synonyms

• Sheave: Another term for the wheel of a pulley.
• Block: A housing containing one or more pulleys.

Notes on Usage

• "Pu-li" is a loanword (from French ) used specifically in mechanical, engineering, and industrial contexts. In everyday conversation, the native term "ròng rọc" is more frequently used.