初三物理知识点总结(国外英文资料).docVIP

初三物理知识点总结(国外英文资料) Physical quantity (unit) formula; deformation of remark formula Speed V (m/S) v= S: distance /t: time Gravity G (N) G=mg M: mass g:9.8N/kg or 10N/kg The density of =m/V m (kg/m3) P: quality: Volume V The resultant force is the same as F (N): F and =F1+F2 In the opposite direction: when F is the opposite of =F1 - F2, F1F2 Buoyancy F float (N) F, floating =G matter - G, depending on the G: the gravity of the object in the liquid Buoyancy F float (N) F floating =G matter, this formula applies only Object floating or suspended Buoyancy F float (N) F =G =m g= P floating row row row row row: G gV liquid liquid gravity Platoon M: the quality of the liquid P: liquid liquid density Platoon V: the volume of the liquid (that is, the volume immersed in a liquid) Lever balance conditions F1L1=, F2L2, F1: power L1: power arm F2: resistance L2: resistance arm Fixed pulley F=G S=h F: the pull of the free end of the rope G: gravity of objects S: the distance at which the end of the rope moves H: the distance that an object rises Moving pulley F= (G object +G wheel) S=2, h, G objects: the gravity of objects G wheel: the gravity of the moving pulley Pulley block F= (G, +G wheel) S=n H N: the number of segments of the rope by moving the pulley Mechanical work W (J) W=Fs F: force S: the distance traveled in the direction of force Useful work, W, yes Total W total W =G H W total =Fs applies pulley block vertically Mechanical efficiency = x 100% Power P (W) P= W: work! T: time Pressure P (Pa) P= F: stress S: force area Liquid pressure P (Pa) P= P GH P: liquid density H: depth (from liquid level to desired point) Vertical distance Unit formula of physical quantity Name, symbol, name, symbol The quality is m kg kg m=pv The temperature is t degrees Celsius, C degrees Celsius Speed v m / sec, m/s v=s/t Density p kg / M 3 kg/m3 p=m/v Force (gravity) F Newton (cow) N G=mg The pressure is P Pascal (PA) Pa P=F/S Work W Joule (focus) J W=Fs Power P watt (W) w P=W/t Current I ampe