Question

explain pulley in two points​

Answer 1

Answer:

Pulley is a simple machine and comprises of a wheel on a fixed axle, with a groove along the edges to guide a rope or cable. Pulleys are used to reduce the time and energy taken to lift heavy objects. Here, Load = the weight of an object Effort = the amount of force required to lift or move this object

Explanation:

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Answer 2

Answer:

1. The earliest evidence of pulleys date back to Ancient Egypt in the Twelfth Dynasty (1991-1802 BCE)[1] and Mesopotamia in the early 2nd millennium BCE.[2] In Roman Egypt, Hero of Alexandria (c. 10-70 CE) identified the pulley as one of six simple machines used to lift weights.[3] Pulleys are assembled to form a block and tackle in order to provide mechanical advantage to apply large forces. Pulleys are also assembled as part of belt and chain drives in order to transmit power from one rotating shaft to another.[4][5] Plutarch's Lives recounts a scene where Archimedes proved the effectiveness of compound pulleys and the block-and-tackle system by using one to pull a fully laden ship towards him as if it was gliding through water. [6]

2. A pulley may have a groove or grooves between flanges around its circumference to locate the cable or belt. The drive element of a pulley system can be a rope, cable, belt, or chain.

Explanation:

The earliest evidence of pulleys date back to Ancient Egypt in the Twelfth Dynasty (1991-1802 BCE)[1] and Mesopotamia in the early 2nd millennium BCE.[2] In Roman Egypt, Hero of Alexandria (c. 10-70 CE) identified the pulley as one of six simple machines used to lift weights.[3] Pulleys are assembled to form a block and tackle in order to provide mechanical advantage to apply large forces. Pulleys are also assembled as part of belt and chain drives in order to transmit power from one rotating shaft to another.[4][5] Plutarch's Lives recounts a scene where Archimedes proved the effectiveness of compound pulleys and the block-and-tackle system by using one to pull a fully laden ship towards him as if it was gliding through water. [6]