ͧç

            ͧç (moment of force) (moment) ¶֧ Ţͧçзӵѵѵعͺشع ѧ ͧç ŤٳͧçѺе駩ҡҡç֧شع ѧٵ

ȷҧͧ 2 ȷҧ
            1. ԡ
            2. ǹԡ

ٻʴȷҧͧ

ҡٻ ԡ = WxL2 (ǵѹ-)
ǹԡ = ExL1 (ǵѹ-)
ççзӵѵت˹ ǷѵعŨ
ͧǹԡ = ͧԡ

ҹ
            ѡâͧ ҹѺػó¡ ҹ (lever) ͤҹմҹѴ ҹͧŪԴ˹觷մѴѵ͹ͺش (fulcrum) ѡɳ ѡ÷ӧҹͧҹѡͧ

ٻʴѡɳТͧҹ

ǹСͺͧҹ ǹСͺӤѭ㹡÷ӧҹͧҹ 3 ǹ
            1. شعͨشš (Fulcrum) F
            2. çҹҹ (W) ͹˹ѡͧѵ
            3. ç (E) çзӵͤҹ

èṡҹ ҹṡ 3 3 ѹѺѧ
            1. ҹѹѺ 1 繤ҹըش (F) ҧç (E) çҹҹ (W) õѴ õѴ ѴǴ д 繵

ٻʴҹѹѺ 1

            2. ҹѹѺ 2 繤ҹçҹҹ (W) ҧç (E) Шشع (F) ԴǴѴ ö繷 Ѵд 繵

ٻʴҹѹѺ 2

            3. ҹѹѺ 3 繤ҹç (E) ҧçҹҹ (W) Шشع (F) º պҹ ˹ 繵

ٻʴҹѹѺ 3

            ü͹çͧҹ դҡ͹´٨ҡ E ֧ F W Ҷ EF 鹡 WF 㹡óշǡҡЪ¼͹ç 鹡ҡ͹ç

ѡäӹdzͧҹ մѧ
            1. ⨷͡˹ѡͧҹ ͧԴ˹ѡͧҹ Ҥҹҡ
            2. 㹡äӹdz ҹբҴ͡ѹʹ
            3. ⨷͡˹ѡҹͧԴ˹ѡҹ ¶ҹ˹ѡͧҹش觡ҧҹ
            4. ͤҹ ǹԡҡѺԡ
            5. ǹԡ ԡդҡѺ źǡͧЪԴ
            6. çҡзӷشع ҢͧդҡѺٹзҧٹ ѧ
= ç x зҧ駩ҡҡشع֧ç
= ç x 0
= 0

ѡäӹdzͧ
ҧ 1 ҹѹ˹ҡչ˹ѡ 30 ǵѹǹ¤ҹҧ˹ ҧشع 2 Ҩеͧǹ˹ѡ 15 ǵѹ ҧҹçѹ㴤ҹ֧

Ըշ صǹ˹ѡ 15 ǵѹ ҧҡشع x Դش F

ͧǹ˹ѡ 15 ǵѹ ҧҡشع 4 ͺ

ҧ 2 ҹ 10 çѴѵ˹ѡ 100 ǵѹ ҧشعҧҡѵ 1 еͧ͡ç¤ҹաҧ˹

Ըշ Դش F

ͧ͡ç = 11.11 ǵѹ ͺ