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?