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일의 원리(지레)

도구의 사용(지레)과 일의 원리에 대한 플래시 카드

TermDefinition
지레 막대의 한점을 받치고, 그 받침점을 중심으로 물체를 움직이는 도구
지레의 3요소 받침점, 힘점, 작용점
받침점 지레를 받쳐주는 지점
힘점 지레에 직접 힘을 작용하는 지점
작용점 지레가 물체에 힘을 작용하는 지점
지레의 원리(지레가 평형상태를 만족하는 조건) w×a=F×b(w:물체의 무게, a:받침점에서 작용점까지의 거리, F:작용한 힘, b:받침점에서 힘점까지의 거리)
지레를 사용할 때의 일 W(일)=힘(F) × 이동거리(s) = 물체의 무게(w) × 물체가 올라간 높이(h)
지레의 종류 1종 지레, 2종 지레, 3종 지레
1종 지레 받침점이 작용점과 힘점 사이에 위치한 지레(가위, 장도리, 손톱깎이 등)
2종 지레 작용점이 받침점과 힘점사이에 위치한 지레(병따개, 호두까개, 작두 등)
3종 지레 힘점이 받침점과 작용점 사이에 위치(핀셋, 젓가락, 낚시대 등)
축바퀴 큰 바퀴와 작은 바퀴를 고정시켜 함께 회전하도록 만든 장치로 지레의 원리로 힘의 이득을 얻는 도구
축바퀴의 종류 자동차 핸들, 수도꼭지, 문 손잡이, 드라이버 등
Created by: 100003039335121
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