2, mass (m=G/g) unit kg, commonly used units t, g, mg.

1t= 103kg 1kg= 103g 1g= 103mg

3. Density (ρ) unit kg/m 3 Common unit g/cm 3 (ρ = m/v)

1g/cm^3= 103kg/m^3 1kg/m^3=0.00 1g/cm^3

4. Pressure (P) unit Pa Common unit mmHg, standard atmospheric pressure (P=F/S)

1pa =1n/m21standard atmospheric pressure = 760mmhg =1.01×105pa.

5, the unit of force (f) n

6. the unit of work (w) is j, 1J= 1N.m (W=Fs).

7. Unit of power (P=W/t) W( 1W= 1J/s) Commonly used unit KW 1KW= 103W

Extended data:

The ratio of the pressure on an object to the stress area is called pressure, which is used to compare the effects of pressure. The greater the pressure, the more obvious the effect of pressure. The calculation formula of pressure is: p=F/S, the unit of pressure is Pascal, and the symbol is Pa.

The methods to increase the pressure are: increasing the pressure under the condition of constant stress area or reducing the stress area under the condition of constant pressure. The methods to reduce the pressure are: reducing the pressure under the condition of constant stress area or increasing the stress area under the condition of constant pressure.

The liquid exerts pressure on the sidewall and bottom of the container, and the pressure increases with the increase of liquid depth.

Power can be divided into electric power, force power and so on. Therefore, the calculation formula is also different.

Electric power calculation formula: p = w/t = ui;

In a pure resistance circuit, if you substitute U=IR into P=UI according to Ohm's law, you can also get: P = I2r = (U2)/R.

In dynamics: power calculation formula: 1.P=W/t (average power) 2. p = Fv; P=Fvcosα (instantaneous power)

Because W=F(F force) ×S(s displacement) (the definition of work), the formula for finding power can also be derived from p = f v:?

P=W /t=F*S/t=F*V (this formula is suitable for objects moving in a straight line at a constant speed).