物理公式单位换算（Unit conversion of physical formulas）.docVIP

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物理公式单位换算（Unit conversion of physical formulas）.doc

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物理公式单位换算（Unit conversion of physical formulas）

物理公式单位换算（Unit conversion of physical formulas） Speed: V (m/S) v= S: distance /t: time Gravity G (N) G=mg (M: mass; g:9.8N/kg or 10N/kg) Density: P P (kg/m3) = m/v (M: V: quality; volume) Resultant force: F (N) in the same direction: F and =F1+F2; in the opposite direction: F and =F1 - F2 in the opposite direction, F1F2 Buoyancy: F floating (N) F floating =G matter - G look (G view: object gravity in liquid) Buoyancy: F floating (N) F floating =G (this formula applies only to objects floating or suspended) Buoyancy: F F =G (N) floating floating row row =m g= P gV (G fluid row row: displaced fluid gravity; m: quality; displaced liquid liquid: liquid density; P V: displaced liquid volume (that is immersed in the liquid volume)) The equilibrium conditions of the lever are: F1L1=, F2L2 (F1: power; L1: power arm; F2: resistance; L2: resistance arm) Fixed pulley: F=G object S=h (F): the pull of the free end of the rope; G object: the gravity of the object; S: the free end of the rope; the moving distance; H: the distance from which the object rises Moving block: F= (G object +G wheel) /2, S=2, H (G object: gravity of object; G wheel: gravity of moving pulley) Pulley block: F= (G, +G wheel), S=n, H (n: number of segments of rope by moving pulley) Mechanical work: W (J) W=Fs (F: force; s: distance in the direction of force) Work hard: W has =G, H Total power: W total W total =Fs for block vertically Mechanical efficiency: =W * 100% /W. Power: P (W) P= w/t (W: work; t: time) Pressure P (Pa) P= F/s (F: pressure; S: force area) Liquid pressure: P (Pa) P= P GH (P: the density of the liquid; H: from the surface to the depth of [the vertical distance]) Heat: Q (J) Q=cm t (C: M: the specific heat capacity of material; quality; t: the change of temperature value) Heat released from combustion: Q (J) Q=mq (M: mass; Q: calorific value) Series circuit current I (A) I=I1=I2=...... Current is equal everywhere Series circuit voltage U (V) U=U1+U2+...... Partial differential action of ser