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bg louti"> <div id="tmyyfroktkho" class="ar_title"> <h1>高考?？脊湍芰课锢砉?/h1> <div id="tmyyfroktkho" class="ar_title_b"> <div id="tmyyfroktkho" class="sub_title clear"> <span id="tmyyfroktkho" class="sp2 c6 fl">時間：<time class="fxtime">2017-01-16 08:31:16</time></span> <span id="tmyyfroktkho" class="sp1 c6 fl"><em id="zuozhe" class="noshow">鳳婷</em><em class="user_id noshow">983</em>由 <em class="nickname"></em> 分享</span> <span id="tmyyfroktkho" class="fl arc_btn"></span> </div> </div> </div> <div id="tmyyfroktkho" class="y_ju"><script type="text/javascript">a("title");</script></div> <div id="tmyyfroktkho" class="con_article con_main" id="contentText"> <p> 　　功和能量是相輔相成的，復(fù)習(xí)這一課程時，同學(xué)們需要掌握相關(guān)公式，下面是學(xué)習(xí)啦小編給大家?guī)淼母呖汲？脊湍芰课锢砉?，希望對你有幫助?/p><p><strong>　　高考?？脊湍芰课锢砉娇偨Y(jié)</strong></p><p> 　　1.功：W=Fscosα(定義式){W:功(J)，F(xiàn):恒力(N)，s:位移(m)，α:F、s間的夾角｝</p><p> 　　2.重力做功：Wab=mghab {m:物體的質(zhì)量，g=9.8m/s2≈10m/s2，hab：a與b高度差(hab=ha-hb)}</p><p> 　　3.電場力做功：Wab=qUab {q:電量(C)，Uab:a與b之間電勢差(V)即Uab=φa-φb｝</p><p> 　　4.電功：W=UIt(普適式) {U：電壓(V)，I:電流(A)，t:通電時間(s)｝</p><p> 　　5.功率：P=W/t(定義式) {P:功率[瓦(W)]，W:t時間內(nèi)所做的功(J)，t:做功所用時間(s)｝</p><p> 　　6.汽車牽引力的功率：P=Fv;P平=Fv平 {P:瞬時功率，P平:平均功率}</p><p> 　　7.汽車以恒定功率啟動、以恒定加速度啟動、汽車最大行駛速度(vmax=P額/f)</p><p> 　　8.電功率：P=UI(普適式) {U：電路電壓(V)，I：電路電流(A)｝</p><p> 　　9.焦耳定律：Q=I2Rt {Q:電熱(J)，I:電流強度(A)，R:電阻值(Ω)，t:通電時間(s)｝</p><p> 　　10.純電阻電路中I=U/R;P=UI=U2/R=I2R;Q=W=UIt=U2t/R=I2Rt</p><p> 　　11.動能：Ek=mv2/2 {Ek:動能(J)，m：物體質(zhì)量(kg)，v:物體瞬時速度(m/s)｝</p><p> 　　12.重力勢能：EP=mgh {EP :重力勢能(J)，g:重力加速度，h:豎直高度(m)(從零勢能面起)｝</p><p> 　　13.電勢能：EA=qφA {EA:帶電體在A點的電勢能(J)，q:電量(C)，φA:A點的電勢(V)(從零勢能面起)｝</p><p> 　　14.動能定理(對物體做正功,物體的動能增加)：</p><p> 　　W合=mvt2/2-mvo2/2或W合=ΔEK</p><p> 　　{W合:外力對物體做的總功，ΔEK:動能變化ΔEK=(mvt2/2-mvo2/2)｝</p><p> 　　15.機械能守恒定律：ΔE=0或EK1+EP1=EK2+EP2也可以是mv12/2+mgh1=mv22/2+mgh2</p><p> 　　16.重力做功與重力勢能的變化(重力做功等于物體重力勢能增量的負(fù)值)WG=-ΔEP</p><p> 　　注:</p><p> 　　(1)功率大小表示做功快慢,做功多少表示能量轉(zhuǎn)化多少;</p><p> 　　(2)O0≤α<90O 做正功;90O<α≤180O做負(fù)功;α=90o不做功(力的方向與位移(速度)方向垂直時該力不做功);</p><p> 　　(3)重力(彈力、電場力、分子力)做正功，則重力(彈性、電、分子)勢能減少</p><p> 　　(4)重力做功和電場力做功均與路徑無關(guān)(見2、3兩式);(5)機械能守恒成立條件：除重力(彈力)外其它力不做功，只是動能和勢能之間的轉(zhuǎn)化;(6)能的其它單位換算:1kWh(度)=3.6×106J，1eV=1.60×10-19J;*(7)彈簧彈性勢能E=kx2/2，與勁度系數(shù)和形變量有關(guān)。</p> </div> <div id="tmyyfroktkho" class="y_ju"><script type="text/javascript">a("conten");</script></div> <div id="tmyyfroktkho" class="pnum"> <ul id="page_slice"> <div id="tmyyfroktkho" class="clear"></div> </ul> </div> </article>  <div id="tmyyfroktkho" class="list_hot ar_related bj_mt20 louti"> <h4 class="title2 title2_te">相關(guān)文章</h4> <ul class="bj_mt20"> <li id="tmyyfroktkho" class="lb_3 chao"> <time>06-09</time> <a href="http://m.rzpgrj.com/xuexifangfa/gaosanwuli/2636172.html" title="高考物理電場與磁場公式總結(jié)" target="_blank">高考物理電場與磁場公式總結(jié)</a> </li> <li id="tmyyfroktkho" class="lb_3 chao"> <time>06-08</time> <a href="http://m.rzpgrj.com/xuexifangfa/gaosanwuli/2636378.html" title="高考物理天體運動公式歸納" 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