• firstly are force, motion, work, energy all in different sections.
  • machines(topic) is both mixture of complicated and simple.
  • what is effort arm

Kindly refer to the link given below to get the answer of your IIIrd statement :
https://www.meritnation.com/ask-answer/question/what-is-load-arm-and-effort-arm/work-and-energy/3994392

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pls ignore the first point...by mistake

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