Page 12 - SIMPLE MACHINES
P. 12

3. A third-class lever: The lever has the effort in the
                   3.     A     th   ird   -  c  l a s s   l ev   er:      T  h  e    l ev  e  r   h  a  s   t h  e    ef   f o  rt    in    t  h e
                          middle, between the load and the fulcrum. This
                          m   id  d  l e,    b  etw     een       t h  e    l o a d    a  n  d   th   e    f  ul c  rum     .    T  h  is

                          arrangement requires large force is to move the load.
                          a  rra    n  g em     en   t   requires             l a rg   e   f  o rc   e    is    to     m  o  v e    t h  e    l o a d  .
                                                                                                                e
                                                         n
                                                           gem
                                                                                                            o
                                                                                                              v
                                                                                                                   m

                                                                                                                                o
                                                  rra
                                                                                                                       en
                                                                                                                            t
                                                                                     il
                                                                          t
                                                                              f
                                                                                a
                                                                                   c
                                                                                        ita

                                                                                                        m
                                                                                                 es
                                                                    en
                                                                                              t
                                               a
                                    th
                                                                                                                                            e
                                                                                                                                                 l
                                         is
                                                                                                                                       t
                                                                                                                                          h

                          But
                          But this arrangement facilitates movement of the load
                                                                                                                                                  o
                                                                                                                                                     a
                                                                                                                                                        d
                                                                                                                                   f


                                                                                       a
                                                                                                                            l
                                                                                            rel
                                                                                                                                                  n


                                                                                  h
                                                                                                                                 m
                                                                                                                                                     t
                                                                                                                             l

                                                                                                              y
                                                                                                                                         em
                                                                                                                      m

                                                                                                                                       v
                                                                                                                   s
                                                                                                             l
                                                                                                     tiv
                                                                                                  a
                                                                                                                                    o
                                                                                                          e
                                                                                                                         a
                                                                                                                                                e


                                      a
                                                            t
                                                                    c
                                           l
                                                                 n
                                               n
                                                               a
                                                 g
                                            o
                          o
                                                                              it
                                                         is
                                                                           w
                             v
                                                                      e
                          over a long distance with a relatively small movement
                                                      d
                               er
                                                     e
                                                            rm
                                                          a
                                                rc

                                 th
                                      e
                          of the force arm.
                          o
                             f
                                           f
                                              o
                                                                  .
                                                      R
                                                 REPRESENTATION OF A THIRD- CLASS LEVER
                                                    P
                                                   E
                                                 R
                                                        E
                                                                                             -
                                                                                           D
                                                                     IO
                                                                                                 L
                                                                                               C
                                                                   T
                                                                                        IR
                                                                              F
                                                                                    T
                                                                                 A
                                                                        N
                                                                                     H
                                                                            O
                                                                 A
                                                            E
                                                                                                            V
                                                              N
                                                                                                                R
                                                          S
                                                                                                              E
                                                                                                          E
                                                                T
                                                                                                    S
                                                                                                  A
                                                                                                         L

                                                                                                      S
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