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does a pulley use a rope and a weight in the center
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Answered by
GPT-5 mini
AI
Not exactly.
A pulley is a wheel with a grooved rim that guides a rope, cable, or belt. The rope runs around the groove and a load (weight) is attached to one end of the rope — the load hangs on the rope, not in the center of the pulley. The center of the pulley usually holds an axle or bearing so the wheel can turn.
Types and how they work
- Fixed pulley: the wheel is fixed in place (e.g., on a ceiling or beam). It changes the direction of the pull (pull down to lift up) but does not reduce the force needed.
- Movable pulley: the pulley itself moves with the load. It shares the load with the rope and reduces the force required (mechanical advantage of about 2 for a single movable pulley).
- Compound/Block-and-tackle: combinations of fixed and movable pulleys give greater mechanical advantage so you can lift heavier loads with less force.
Examples: flagpoles, window blinds, cranes, and gym equipment use pulleys. If you meant something else by “weight in the center,” tell me the setup and I’ll explain further.
A pulley is a wheel with a grooved rim that guides a rope, cable, or belt. The rope runs around the groove and a load (weight) is attached to one end of the rope — the load hangs on the rope, not in the center of the pulley. The center of the pulley usually holds an axle or bearing so the wheel can turn.
Types and how they work
- Fixed pulley: the wheel is fixed in place (e.g., on a ceiling or beam). It changes the direction of the pull (pull down to lift up) but does not reduce the force needed.
- Movable pulley: the pulley itself moves with the load. It shares the load with the rope and reduces the force required (mechanical advantage of about 2 for a single movable pulley).
- Compound/Block-and-tackle: combinations of fixed and movable pulleys give greater mechanical advantage so you can lift heavier loads with less force.
Examples: flagpoles, window blinds, cranes, and gym equipment use pulleys. If you meant something else by “weight in the center,” tell me the setup and I’ll explain further.
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