物理中考必考公式
首先,力学:
1,速度:V=S/t?
2.重力:G=mg?
3.密度:ρ=m/V?
4.压力:p=F/S?
5.液体压力:p=ρgh?
6.浮力:?
F float = f'-f(压差);F float = g-f(表观重力);f浮动= g(浮动,浮动);F float =G row = ρ liquid gV row?
7.杠杆平衡条件:F1L1 = F2L2?
8.理想斜率:f/g = h/l?
9.理想滑轮:F=G/n?
10,实际滑轮:f = (g+g移动)/n?
11,功:W = FS = GH(把物体举得很高)
12,功率:p = w/t = Fv?
13,工作原理:W手= W机?
14,实际机械:w合计= w加+w额外?
15,机械效率:η = w Yes /W Total?
二、热力:
1,吸热:Q吸热= cm (t-t0) = cm δ t?
2.放热:Q = cm (t0-t) = cm δ t?
3.发热量:q = q/m?
4.炉子和热机的效率:η = q有效利用率/Q燃料?
5.热平衡方程:q-排出= q-吸入?
6.热力学温度:t = t+273 K?
第三,电:
1,电流强度:I = Q次方/t?
2.阻力:R=ρL/S?
3.欧姆定律:I = u/r?
4.串联电路:?
(1)I=I1=I2?
(2)U=U1+U2?
(3)R=R1+R2?
(4) U1/U2 = r1/R2(分压公式)?
(5)P1/P2=R1/R2?
5.并联电路:?
(1)I=I1+I2?
(2)U=U1=U2?
(3)1/R = 1/R 1+1/R2[R = R 1r 2/(R 1+R2)]?
(4) i1/I2 = R2/r1(分流公式)
(5)P1/P2=R2/R1?