Summary of physics formulas for junior high school, summary of physics formulas for junior high scho

There are a lot of them in the library or there are a lot of them that I know.

(1) Speed1) Definition: Velocity is a physical quantity that describes the speed and direction of the motion of a particle, equal to the ratio of the displacement to the time taken for the displacement to occur.

2) Formula: v=s t (v is the speed, s is the distance, t is the time).(2) Gravity1) Definition: The force experienced by an object due to the attraction of the earth is called gravity.

2) Formula: g=m*g (g is the gravity m mass of the object g gravity coefficient).(3) Density1) Definition: The ratio of mass to volume of a substance.

2) Formula: =m v ( is the density m mass of the object v the volume of the object).(4) Pressure1) Determination and destruction: The ratio of the pressure to the force area of the object is called pressure.

2) Formula: P=F s (Pressure P, Pressure F, Pure Area S).(5) Liquid pressureFormula: p = gh ( is the density of the liquid, g is the gravitational coefficient, g = ; h is the depth).(6) Mechanical work1) Definitions:

Work is equal to the product of the force and the distance that the object passes in the direction of the force2) Formula: w = fs (w is the work f is the force physically experienced s s is the distance).(7) Power1) Definition: The power of work done per unit of time.

Power is a physical quantity that indicates how fast or slow an object does work.

2) Formula: p=w t (power p work w time t).

It is very important to learn junior high school physics and master physics formulas, and the following is a summary of the physics formulas for junior high school, hoping to help you learn physics.

1. Series circuit(1), W UIT PT UQ (universal formula) (pure resistance formula).

Partial pressure formula).2. Parallel circuit[ r＝r1r2/(r1＋r2)]

shunt formula).3. Current formula1.Current intensity: i q power t

2.Resistance: r= l s

3.Ohm's Law: i u r

4.Joule's Law:

1）q＝i2rt

2) Q uit pt uq power u2t r (pure resistance formula).Fourth, the thermal formulac water

1.Endothermy: Q absorbs cm(t t0) cmδt2Exothermic: Q exothermic cm(t0 t) cmδt3Calorific value: q q m

4.Efficiency of furnaces and heat engines: Q efficient use of fuel.

5.Thermal equilibrium equation: q release and q suck.

6.Thermodynamic temperature: t t 273k

7.Fuel combustion exothermic formula Q Absorption MQ or Q Absorption VQ (applicable to natural gas, etc.).5. The formula of workw fs when lifting the object up w ghw pt

Sixth, the power formulap＝w/tp＝w/t=fs/t=fv（v＝p/f）7. Useful work formulaLifting w has gh level w fsw has w total w amount.

8. Formula of total workw total fs(s nh) w total w has w total w has w total w has w amount w total p total t