ç

            ç (force) ¶֧ ҳзӵѵǷѵ¹ŧҡҾ çҨʡѺѵʡѺѵء ç֧ çѡ ç¡ çǡзӺ鹼Ǣͧѵ çҧԴ ç çҧ俿 çǧзӺǢͧѵ зӡѺͧ͢ѵطء˹ ˹ѡͧѵ ç֧ٴͧšзӡѺѵͧʡѺǢͧѵ çѴ繻ҳǡ շ駢Ҵзȷҧ ˹¢ͧçк ǵѹ (N) ͧҡç繻ҳǡ ѭѡɳ¹᷹ç

ǡͧç
            ҳҧҳѹ㹪ԵШѹ͡੾ТҴ§ҧǡ ó ҧҳеͧ͡駢Ҵзȷҧ֧·ó ҳ㹷ҧԡ͡ 2
            1. ҳ (scalar quantity) ҳ͡袹Ҵҧǡ·ó ͧ͡ȷҧ зҧ ѧҹ ҹ ҵ 㹡ҼѾͧҳѡҧժԵ Ըաúǡ ź ٳ
            2. ҳǡ (vector quantity) ҳͧú͡駢Ҵзȷҧ֧·ó áШѴ ç

ѡɳзӤѭͧҳǡ
            1. ѭѡɳͧҳǡ ʴҴзȷҧͧ ҳǡ١᷹ ¢Ҵͧҳǡ᷹¤Ǣͧ١зȷҧͧҳǡ ᷹·ȷҧͧ١ ѭѡɳͧҳǡ ѡ١ä觺ҡ仢ʴҳǡ ѧٻ

ҡٻ ǡ A բҴ 4 ˹ 价ҧȵѹ͡
ǡ B բҴ 3 ˹ 价ҧ

            2. ǡҡѹ ǡ 2 ǡҡѹբҴҡѹзȷҧ价ҧǡѹ ѧٻ

ҡٻ ǡ A ҡѺ ǡ B ¹ѭѡɳ

ǡ C ҡѺ ǡ D ¹ѭѡɳ

            3. ǡçѹ ǡ 2 ǡеçѹ ǡͧբҴҡѹ շȷҧçѹ ѧٻ

ҡٻ ǡ A çѺǡ B ¹ѭѡɳ
ǡ C çѺǡ D ¹ѭѡɳ

ͤ÷Һ 㹡ҼѾͧҳǡ Ըա÷ҧǡ 觵ͧҼѾ駢Ҵзȷҧ

ҼѾͧçç
ççͨçѾ§ç ѭѡɳ ¡ (ԡ) ᷹ źǡç зӾ ѹش ѧ


¹᷹źǡѭѡɳ

            ç ҤçѾ () ͧç· Ըա͹ѹѺǡѾ ç繻ҳǡ ҨػԸաçѾѧ
            1. ԸաҴٻẺҧ çѾԸ ù¹ҧͧçͧ仵͡Ѻ١âͧçáйҧͧç 仵͡ѺǢͧçͧ 蹹 úءç çѾ çҡҡҧͧçáѧǢͧçش ѧٻ

            2. Ըաäӹdz çѾͧç· 2 ç
                        1) çͧç㹷ҧǡѹ çѾբҴҡѺźǡͧçͧ ǹȷҧͧçѾ价ȷҧǡѺçͧ ѧٻ

ٻʴçѾͧç 2 ç շȷҧ价ҧǡѹ

            2) çͧçǹҧѹ çѾբҴҡѺŵҧͧçͧ ȷҧͧçѾ价ҧçբҴҡ ѧٻ


ٻʴçѾͧç 2 ç շȷҧçѹ

ŢͧçѾ͡͹ͧѵ
            ѵصҧ çҡз ѵبա¹ŧҾ 3 ѡɳ
            1. ա¹ŧ˹
            2. ա¹ŧ
            3. ա¹ŧٻҧТҴ
            çзѵᵡҧѹ Ţͧ¹ŧᵡҧѹ仴 çзդҡ ¹ŧ繼Ţͧçա¹ŧҡ
㹪ԵШѹ ÷ѵա¹ŧҧ ԴҡԷԾŢͧç ç辺ҵҡªԴ 觡ռŵ͡¹ŧͧѵᵡҧѹ

ͤ÷Һ
            - çз㹷ȷҧǡѺ͹ зѵդ
            - çз㹷ȷҧçѺ͹ зѵդŴŧ

͹

͹ͧǵѹ
            ᫡ ǵѹ (Sir Issac Newton) ѡԡ ѧ ػǡѺ͹ͧѵط駷ҾҾ ͹繡͹ͧǵѹ ö㨡͹ҧ ͧǵѹ 3
            1. ͹ͷ˹觢ͧǵѹ Ҩ¡ 觤 (inertia law) "ѵبФҾ Ҿ͹¤Ǥǵç ͡ҡçѾդٹҡз" ػ ѧ

            ҡ͹ͷ 1 ͧǵѹ͸Ժ ѵҧ躹Һçҡзӵѵ ѵءѧ ͶçͧçҡзӵѵçͧբҴҡѹȷҧç ѹо ѵѧش ֧ػ "ѵط觶ç¹͡ ҡзӵѵç¹͡çҡзӵѵ çѾҹٹѵعѧѡҾҧ " ѧٻ

            ͶҾԨóѵطѧ͹躹дѺҺ蹫ç ͡ҡзӵѵ ѵءѡҾ͹¤ǤǤ˹ Ͷçͧçҡзӵѵآѵءѧ͹ çͧբҴҡѹշȷҧçѹ о ѵѧѡҾ͹¤Ǥǹ鹵 ֧ػ " ѵطѧ͹¤Ǥ˹觶ç¹͡ҡзӵ ѵ Ͷç¹͡çҡзӵѵçѾͧçҹ ٹ ѵعѧѡҾ͹¤Ǥǹ鹵ʹ" ѧٻ

            ҡǢҧöػ "çѾзӵѵٹѵب¹Ҿ͹ Ǥ ѵ觡觵ʹѵءѧ͹ ¤Ǥ˹ѵع鹡ѧ͹ǵçȷҧ ¤Ǥǹ鹵ʹ"
            2. ͹ͷͧͧǵѹ Ҩ¡ 觤 Ţͧѵؤ¹Ҵͧç (F) ҡ (a) ͧѵءҡ鹴¨֧ػ ҴͧüѹçѺҴͧçѾзӵѵ Ť¹ѭѡɳ

жçѾ (F) зӵѵؤ ¹ (m)ҡ (a) ͧѵءŴŧ ֧ػ ҴͧüѹѺŢͧѵ ¹ѭѡɳ

ҡҧػ (a) ѴǹµçѺç (F) ѧѵǹͧçѺ觨繤Ҥ觵çѺ (m) ͧѵ ¹繤ѹ

            ѧ ֧ػ繡ͷͧͧǵѹ " çѾբҴٹҡзӵѵ зѵԴ㹷ǡѺçѾҡз ТҴͧ觨üѹçѺҴͧçѾШüѹѺŢͧ ѵ"

ҧ 1 ͡ç 8 ǵѹ зӡѺѵ 32 š ѵبդ

ͺ

ҧ 2 10 š ͧ͹¤ 6 õԹҷաѧͧ еͧ͡çз
ͺ
            3. ͹ͷͧǵѹ ҡ͹ ͷ˹ͧͧǵѹ͸ԺҾ͹ͧѵç ¹͡ҡзӵѵ 觨ҡ֡㹢зçҡзӵѵ ѵب͡çͺçҡзӹ鹴 ͡ç֧ͧʻԧ Ҩ֡ͧʻԧ֧Ҵ͡ç֧ͧ ʻԧçҡҡ֡ͧʻԧ觴֧ ҡҹ ѧٻ

            ҡҧо çзӵѵ˹ ѵع鹡͡çͺ㹷ȷҧçѺçҡз çͧçԴ鹾ѹ ¡çҡзӵѵ "ç" (action force) ¡çѵͺçҡз "çԡ" (reaction force) ç֧ͧ¡ѹ "ç-çԡ" (action-reaction) ֧ػѹҧçҡѺçԡ繡͹ ͷ 3 ͧǵѹ "çҷءçͧçԡҫբҴҡѹзȷҧçѹ " action = reaction ¤ çҡзӵѵ㴡çԡҨҡѵعբҴ çҡѹзӡѺѵؤС͹ ֧çѡҧѺçԡ óöعѢ ç çöعѢ ֧عѢ 㹢ǡѹçԡ çعѢö ֧öغ · 2 ʴçѡҧѹ ѧٻ

ٻöعѢ

ͤè ѡɳӤѭͧççԡ
            1. Դ鹾ѹ
            2. բҴҡѹ
            3. շȷҧçѹ
            4. зӵѵؤС͹