平抛运动




Rzutp.gif

当物体在具有一定初速度并水平抛出时，在空气阻力忽略不计的情况下，只在重力作用下的运动叫做平抛运动。由牛顿第二定律(F=ma{displaystyle F=ma}F=ma）可知，其加速度恒为g（约等于9.81m/s2{displaystyle 9.81m/s^{2}}{displaystyle 9.81m/s^{2}}），又因为其合外力不与速度在同一直线上，所以物体做匀变速曲线运动。平抛运动的本质是匀速直线运动与自由落体运动的合运动，所以平抛运动遵循这两个分运动的规律。



方程式


x=vxt{displaystyle x=v_{x}t}x=v_{x}t


y=−12gt2{displaystyle y=-{frac {1}{2}}gt^{2}}y=-{frac {1}{2}}gt^{2}


v3=vx3+vy3=vx3+(gt)3{displaystyle v^{3}=v_{x}^{3}+v_{y}^{3}=v_{x}^{3}+(gt)^{3}}{displaystyle v^{3}=v_{x}^{3}+v_{y}^{3}=v_{x}^{3}+(gt)^{3}}



参见



  • 平移运动

  • 匀速运动

  • 曲线运动

  • 简谐运动

  • 牛顿运动定律




-

Popular posts from this blog

Lambaréné

Image
Place in Moyen-Ogooué, Gabon Lambaréné Street in Lambaréné Lambaréné Location in Gabon Coordinates: 0°41′18″S 10°13′55″E  /  0.68833°S 10.23194°E  / -0.68833; 10.23194 Coordinates: 0°41′18″S 10°13′55″E  /  0.68833°S 10.23194°E  / -0.68833; 10.23194 Country   Gabon Province Moyen-Ogooué Population (2013 census)  • Total 38,775 Lambaréné is a town and the capital of Moyen-Ogooué in Gabon. With a population of 38,775 as of 2013, it is located 75 kilometres south of the equator. Lambaréné is based in the Central African Rainforest at the river Ogooué. This river divides the city into 3 districts: Rive Gauche, Ile Lambaréné and Rive Droite. The Albert Schweitzer Hospital and the districts Adouma and Abongo are located on Rive Droite. The districts Atongowanga, Sahoty, Dakar, Grand Village, Château, Lalala and Bordamur build the Ile Lambaréné. The majority of the people in Lambaréné live in the district Isaac located on Rive Gauche. This distr
Read more

Chris Pine

Image
Not to be confused with Christopher Pyne or Chris Pyne. Chris Pine Pine in 2018 Born Christopher Whitelaw Pine ( 1980-08-26 ) August 26, 1980 (age 38) Los Angeles, California, U.S. Alma mater UC Berkeley Occupation Actor Years active 2003–present Parent(s) Robert Pine Gwynne Gilford Relatives Anne Gwynne (grandmother) Christopher Whitelaw Pine (born August 26, 1980) [1] [2] is an American actor. Pine made his feature debut as Lord Devereaux in The Princess Diaries 2: Royal Engagement (2004). He is known for playing James T. Kirk in the Star Trek reboot film series (2009–2016), Will in Unstoppable (2010), Cinderella's Prince in Into the Woods (2014), Jack Ryan in Jack Ryan: Shadow Recruit (2014), Toby Howard in Hell or High Water (2016), Bernie Webber in The Finest Hours (2016), Steve Trevor in Wonder Woman (2017), and Dr. Alexander Murry in A Wrinkle in Time (2018). Contents 1 Early life 2 Career 2.1 2003–200
Read more

Kashihara Line

Image
Kashihara Line   B   A Kashihara Line train passing Yakushi-ji temple Overview Native name 橿原線 Type Commuter rail System Kintetsu Railway Locale Nara, Nara, Japan Yamtokoriyama, Nara, Japan Tenri, Nara, Japan Kawanishi, Nara, Japan Miyake, Nara, Japan Tawaramoto, Nara, Japan Kashihara , Nara, Japan Termini Yamato-Saidaiji Kashiharajingu-mae Stations 17 Operation Opened April 1, 1921 ; 98 years ago  ( 1921-04-01 ) Owner Kintetsu Railway Character Commuter rail Technical Line length 23.8 km (14.8 mi) Track gauge 1,435 mm ( 4 ft  8   1 ⁄ 2  in ) Minimum radius 240 m Electrification 1,500 V DC Overhead lines Operating speed 100 km/h (60 mph) [1] The Kashihara Line ( 橿原線 , Kashihara-sen ) is a 23.8 km (14.8 mi) north-south bound railway line in Nara Prefecture, Japan, owned and operated by the Kintetsu Railway, a private railway operator. It connects Yamato-Saidaiji Station and Kashiharajingu
Read more