平抛运动

Multi tool use
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}
)可知,其加速度恒为g(约等于9.81m/s2{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}
y=−12gt2{displaystyle 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}}
参见
- 平移运动
- 匀速运动
- 曲线运动
- 简谐运动
- 牛顿运动定律
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