admin 发表于 2024-10-2 16:05:17

中考物理复习:常用物理公式大全,考前必背!

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辅导君说

进入初中新增物理学科,所以同学们就有一点担心,初中的物理难度大吗?难度肯定是有的,但是如果同学们在小学基础学的很好的话,那么对同学们来说就没有什么难度了。今天辅导君和大家分享的是中考物理复习:常用物理公式大全,希望能够对同学们有帮助!

中考物理复习:常用公式大全

一、速度公式

物理量 计算式 国际主单位 常用单位 换算关系

速度v V=s/t m/s Km/h 1m/s=3.6km/h

路程s S=vt m Km 1km=1000m

时间t t=s/v s h 1h=60min=3600s

火车过桥(洞)时通过的路程s=L桥+L车

声音在空气中的传播速度为340m/s

光在空气中的传播速度为3×108m/s

二、密度公式

(ρ水=1.0×103 kg/m3)

物理量 计算式 国际主单位 常用单位 换算关系

密度ρ ρ=m/v Kg/ m3 g/ Cm3 1g/ Cm3=/ m3

质量m M=ρv Kg g 1kg=1000g

体积v V=m/ρ m3 Cm3 1 m3== 1L=103ml(cm3)

冰与水之间状态发生变化时m水=m冰 ρ水>ρ冰 v水<v冰

同一个容器装满不同的液体时,不同液体的体积相等,密度大的质量大

空心球空心部分体积V空=V总-V实

三、重力公式

G=mg (通常g取10N/kg,题目未交待时g取9.8N/kg)

同一物体G月=1/6G地 m月=m地

四、杠杆平衡条件公式

F1l1=F2l2 F1 /F2=l2/l1

五、动滑轮公式

不计绳重和摩擦时F=1/2(G动+G物)s=2h

六、滑轮组公式

不计绳重和摩擦时F=1/n(G动+G物)s=nh

七、压强公式(普适)

P=F/S固体平放时F=G=mg

S的国际主单位是m2 1m2===

八、液体压强公式

P=ρgh

液体压力公式F=PS=ρghS

规则物体(正方体、长方体、圆柱体)公式通用

九、浮力公式

(1)F浮=F’-F (压力差法)

(2)F浮=G-F (视重法)

(3)F浮=G (漂浮、悬浮法)

(4)阿基米德原理:F浮=G排=ρ液gV排 (排水法)

十、功的公式

W=FS把物体举高时W=GhW=Pt

十一、功率公式

P=W/tP=W/t=Fs/t=Fv(v=P/F)

十二、有用功公式

举高W有=Gh水平W有=FsW有=W总-W额

十三、总功公式

W总=FS (S=nh)W总=W有/ηW总= W有+W额 W总=P总t

十四、机械效率公式

η=W有/W总 η=P有/ P总

(在滑轮组中η=G/Fn)

(1)、η=G/ nF(竖直方向)

(2)、η=G/(G+G动) (竖直方向不计摩擦)

(3)、η=f / nF (水平方向)

十五、热学公式

C水=4.2×103J/(Kg·℃)

1、吸热:Q吸=Cm(t-t0)=CmΔt

2、放热:Q放=Cm(t0-t)=CmΔt

3、热值:q=Q/m

4、炉子和热机的效率:η=Q有效利用/Q燃料

5、热平衡方程:Q放=Q吸

6、热力学温度:T=t+273K

7.燃料燃烧放热公式Q吸=mq或Q吸=Vq(适用于天然气等)

电学部分

1、电流强度:I=Q电量/t

2、电阻:R=ρL/S

3、欧姆定律:I=U/R

4、焦耳定律:

(1)、Q=I2Rt普适公式)

(2)、Q=UIt=Pt=UQ电量=U2t/R (纯电阻公式)

5、串联电路:

(1)I=I1=I2

(2)U=U1+U2

(3)R=R1+R2 (1)、W=UIt=Pt=UQ (普适公式)

(2)W=I2Rt=U2t/R (纯电阻公式)

(4)U1/U2=R1/R2 (分压公式)

(5)P1/P2=R1/R2

6、并联电路:

(1)I=I1+I2

(2)U=U1=U2

(3)1/R=1/R1+1/R2 [ R=R1R2/(R1+R2)]

(4)I1/I2=R2/R1(分流公式)

(5)P1/P2=R2/R1

7、定值电阻:

(1)I1/I2=U1/U2

(2)P1/P2=I12/I22

(3)P1/P2=U12/U22

8、电功:

(1)W=UIt=Pt=UQ (普适公式)

(2)W=I2Rt=U2t/R (纯电阻公式)

9、电功率:

(1)P=W/t=UI (普适公式)

(2)P=I2R=U2/R (纯电阻公式)

常用物理量

1、光速:C=3×108m/s (真空中)

2、声速:V=340m/s (15℃)

3、人耳区分回声:≥0.1s

4、重力加速度:g=9.8N/kg≈10N/kg

5、标准大气压值:760毫米水银柱高=1.01×105Pa

6、水的密度:ρ=1.0×103kg/m3

7、水的凝固点:0℃

8、水的沸点:100℃

9、水的比热容:C=4.2×103J/(kg?℃)

10、元电荷:e=1.6×10-19C

11、一节干电池电压:1.5V

12、一节铅蓄电池电压:2V

13、对于人体的安全电压:≤36V(不高于36V)

14、动力电路的电压:380V

15、家庭电路电压:220V

16、单位换算:

(1)1m/s=3.6km/h

(2)1g/cm3 =103kg/m3

(3)1kw?h=3.6×106J

历史优质文章、合集资料等(可上下滑动)

各种资料持续更新,如需其它资料请后台留言。

<p><pre ng-bind-html="message.MMActualContent" style="outline: 0px;max-width: 100%;visibility: visible;box-sizing: border-box !important;overflow-wrap: break-word !important;">    <section data-tools="135编辑器" data-id="97727" style="outline: 0px;max-width: 100%;visibility: visible;box-sizing: border-box !important;overflow-wrap: break-word !important;"><section style="outline: 0px;max-width: 100%;visibility: visible;box-sizing: border-box !important;overflow-wrap: break-word !important;"><section style="outline: 0px;max-width: 100%;visibility: visible;box-sizing: border-box !important;overflow-wrap: break-word !important;"><section style="outline: 0px;max-width: 100%;visibility: visible;box-sizing: border-box !important;overflow-wrap: break-word !important;"><section style="outline: 0px;max-width: 100%;visibility: visible;box-sizing: border-box !important;overflow-wrap: break-word !important;"><section style="outline: 0px;max-width: 100%;visibility: visible;box-sizing: border-box 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<p><pre ng-bind-html="message.MMActualContent" style="outline: 0px;max-width: 100%;visibility: visible;box-sizing: border-box !important;overflow-wrap: break-word !important;">    <section data-tools="135编辑器" data-id="97727" style="outline: 0px;max-width: 100%;visibility: visible;box-sizing: border-box !important;overflow-wrap: break-word !important;"><section style="outline: 0px;max-width: 100%;visibility: visible;box-sizing: border-box !important;overflow-wrap: break-word !important;"><section style="outline: 0px;max-width: 100%;visibility: visible;box-sizing: border-box !important;overflow-wrap: break-word !important;"><section style="outline: 0px;max-width: 100%;visibility: visible;box-sizing: border-box !important;overflow-wrap: break-word !important;"><section style="outline: 0px;max-width: 100%;visibility: visible;box-sizing: border-box !important;overflow-wrap: break-word !important;"><section style="outline: 0px;max-width: 100%;visibility: visible;box-sizing: border-box 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style="outline: 0px;max-width: 100%;visibility: visible;box-sizing: border-box !important;overflow-wrap: break-word !important;"><section data-role="paragraph" style="outline: 0px;max-width: 100%;visibility: visible;box-sizing: border-box !important;overflow-wrap: break-word !important;"><section style="margin: 5px 16px;outline: 0px;max-width: 100%;box-sizing: border-box;font-size: 16px;text-size-adjust: inherit;letter-spacing: 0.544px;caret-color: rgba(0, 0, 0, 0);background-color: rgb(247, 247, 247);line-height: normal;font-family: system-ui, -apple-system, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif;visibility: visible;overflow-wrap: break-word !important;"><section style="padding: 15px;outline: 0px;max-width: 100%;box-sizing: border-box;display: flex;align-items: center;justify-content: center;flex-direction: column;visibility: visible;overflow-wrap: break-word !important;"><section style="outline: 0px;max-width: 100%;min-height: 1em;line-height: normal;text-align: left;visibility: visible;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="outline: 0px;max-width: 100%;font-size: 12px;color: rgb(136, 136, 136);letter-spacing: 0.627692px;font-family: -apple-system-font, BlinkMacSystemFont, Arial, sans-serif;visibility: visible;box-sizing: border-box !important;overflow-wrap: break-word !important;"><h1 style="margin: 10px 8px;outline: 0px;font-size: 22px;max-width: 100%;caret-color: rgb(34, 34, 34);color: rgb(34, 34, 34);letter-spacing: 0.544px;text-size-adjust: inherit;line-height: 1.5em;visibility: visible;font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="outline: 0px;max-width: 100%;visibility: visible;font-size: 15px;font-family: mp-quote, -apple-system-font, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif;box-sizing: border-box !important;overflow-wrap: break-word !important;">微信又改了!!http://kuailexuexi.net/data/attachment/forum/20241002/1727856317830_6.pnghttp://kuailexuexi.net/data/attachment/forum/20241002/1727856317830_6.png</span></h1><h1 style="margin: 10px 8px;outline: 0px;font-size: 22px;max-width: 100%;caret-color: rgb(34, 34, 34);color: rgb(34, 34, 34);letter-spacing: 0.544px;text-size-adjust: inherit;line-height: 1.5em;visibility: visible;font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="outline: 0px;max-width: 100%;visibility: visible;font-size: 15px;font-family: mp-quote, -apple-system-font, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif;box-sizing: border-box !important;overflow-wrap: break-word !important;">后台有读者私信,问辅导君怎么有时候找不到最新推送的信息。实际情况是,</span>我们每天都会及时更新<span style="outline: 0px;max-width: 100%;font-family: mp-quote, -apple-system-font, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif;font-size: 15px;letter-spacing: 0.544px;visibility: visible;box-sizing: border-box !important;overflow-wrap: break-word !important;">,没有</span>将<span style="outline: 0px;max-width: 100%;letter-spacing: 0.544px;visibility: visible;color: rgb(192, 0, 0);box-sizing: border-box !important;overflow-wrap: break-word !important;">锋盛中小学辅导</span>公众号设置为<span style="outline: 0px;max-width: 100%;font-size: 18px;color: rgb(190, 26, 29);visibility: visible;box-sizing: border-box !important;overflow-wrap: break-word !important;">星标</span>的朋友们,<span style="outline: 0px;max-width: 100%;font-size: 15px;visibility: visible;box-sizing: border-box !important;overflow-wrap: break-word !important;">可能我们就无法相遇了。</span></h1><h1 style="margin: 10px 8px;outline: 0px;font-size: 22px;max-width: 100%;caret-color: rgb(34, 34, 34);color: rgb(34, 34, 34);letter-spacing: 0.544px;text-size-adjust: inherit;line-height: 1.5em;visibility: visible;font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="outline: 0px;max-width: 100%;letter-spacing: 0.544px;visibility: visible;font-family: mp-quote, -apple-system-font, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif;font-size: 15px;box-sizing: border-box !important;overflow-wrap: break-word !important;">所以,<span style="outline: 0px;max-width: 100%;letter-spacing: 0.544px;visibility: visible;caret-color: rgba(0, 0, 0, 0.9);color: rgba(0, 0, 0, 0.9);font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif;text-size-adjust: inherit;box-sizing: border-box !important;overflow-wrap: break-word !important;">请大家花两秒钟时间,</span><span style="outline: 0px;max-width: 100%;letter-spacing: 0.544px;visibility: visible;caret-color: rgba(0, 0, 0, 0.9);color: rgba(0, 0, 0, 0.9);font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif;text-size-adjust: inherit;box-sizing: border-box !important;overflow-wrap: break-word !important;">按照图中步骤把我们设为星标</span></span></h1><h1 style="margin: 10px 8px;outline: 0px;font-size: 22px;max-width: 100%;caret-color: rgb(34, 34, 34);color: rgb(34, 34, 34);letter-spacing: 0.544px;text-size-adjust: inherit;line-height: 1.5em;visibility: visible;font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif;box-sizing: border-box !important;overflow-wrap: break-word !important;"><span style="outline: 0px;max-width: 100%;font-size: 15px;visibility: visible;box-sizing: border-box !important;overflow-wrap: break-word !important;">打开【锋盛中小学辅导】公众号对话框,点击右上角的小人标志➡️找到右上角“…” ➡️点击设为星标</span></h1></span></section></section><section style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;">http://kuailexuexi.net/data/attachment/forum/20241002/1727856317830_8.gif
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<p><pre ng-bind-html="message.MMActualContent" data-mpa-powered-by="yiban.io" data-darkmode-bgcolor-16474826149653="rgb(25, 25, 25)" data-darkmode-original-bgcolor-16474826149653="#fff|rgb(255, 255, 255)" style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;">    <section data-role="outer" data-darkmode-bgcolor-16474826149653="rgb(25, 25, 25)" data-darkmode-original-bgcolor-16474826149653="#fff|rgb(255, 255, 255)" style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"><pre ng-bind-html="message.MMActualContent" data-mpa-powered-by="yiban.io" data-darkmode-bgcolor-16474826149653="rgb(25, 25, 25)" data-darkmode-original-bgcolor-16474826149653="#fff|rgb(255, 255, 255)" style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"><section powered-by="xiumi.us" tabindex="0" data-darkmode-bgcolor-16474826149653="rgb(25, 25, 25)" data-darkmode-original-bgcolor-16474826149653="#fff|rgb(255, 255, 255)" style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"><section data-width="100%" data-darkmode-bgcolor-16474826149653="rgb(25, 25, 25)" data-darkmode-original-bgcolor-16474826149653="#fff|rgb(255, 255, 255)" data-darkmode-color-16474826149653="rgb(163, 163, 163)" data-darkmode-original-color-16474826149653="#fff|rgb(62, 62, 62)" data-style="outline: 0px; max-width: 100%; box-sizing: border-box; caret-color: rgb(255, 0, 0); color: rgb(62, 62, 62); letter-spacing: 0.544px; text-align: center; width: 677px; border-top: 1px dashed rgb(125, 122, 121); border-right: 1px dashed rgb(125, 122, 121); border-bottom-style: none; border-left: 1px dashed rgb(125, 122, 121); font-family: 微软雅黑; overflow-wrap: break-word !important;" style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"><section data-tools="135编辑器" data-id="94089" style="outline: 0px;max-width: 100%;caret-color: rgba(0, 0, 0, 0.8);color: rgba(0, 0, 0, 0.8);font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif;letter-spacing: 0.544px;white-space: normal;text-size-adjust: inherit;box-sizing: border-box !important;overflow-wrap: break-word !important;"><section style="outline: 0px;max-width: 100%;box-sizing: border-box !important;overflow-wrap: break-word !important;"><section style="outline: 0px;max-width: 100%;display: flex;justify-content: center;align-items: flex-end;box-sizing: border-box !important;overflow-wrap: break-word !important;"><section data-width="25%" style="outline: 0px;max-width: 100%;box-sizing: border-box;width: 144.5px;border-bottom: 1px dashed rgb(51, 51, 51);height: 1px;overflow: hidden;overflow-wrap: break-word !important;"><br style="outline: 0px;max-width: 100%;letter-spacing: 0.544px;background-color: rgb(255, 255, 255);box-sizing: border-box !important;overflow-wrap: break-word !important;"/></section></section></section></section></section></section></pre></p>
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