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相关概念视频

Impact: Problem Solving01:26

Impact: Problem Solving

In an experiment conducted during a Mars mission, a rover propels a projectile with an initial velocity, and the projectile rebounds after colliding with the Martian surface. To ascertain the maximum height attained by the projectile after this collision, the known restitution coefficient and acceleration due to gravity are employed.
By designating the launch point as the origin and utilizing kinematic equations, the vertical component of the projectile's velocity at the point of impact is...
Projectile Motion: Example01:18

Projectile Motion: Example

The theory of projectile motion is very useful for players of several sports to improve their performance. For example, a javelin thrower needs to throw their javelin in such a way that it travels as far as possible. The javelin thrower takes a short run-up to increase the initial speed of the javelin. The range of a projectile is at its maximum at a 45° angle so javelin throwers try to angle their throw as close to 45° as possible.
When we speak of the range (R) of a projectile on level...

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相关实验视频

Updated: Jul 12, 2026

A Test Bed to Examine Helmet Fit and Retention and Biomechanical Measures of Head and Neck Injury in Simulated Impact
07:30

A Test Bed to Examine Helmet Fit and Retention and Biomechanical Measures of Head and Neck Injury in Simulated Impact

Published on: September 21, 2017

阿波罗12号月球模块撞击:实验室模拟和可能的下射程弹道效应.

H F Swift, T R McGetchin, D D Preonas

    Science (New York, N.Y.)
    |August 28, 1970
    PubMed
    概括

    塑料颗粒对沙子目标的冲击模仿了阿波罗12号月球模块 (LM) 的冲击,造成浅坑. 碎片从远处再次撞击,但这种弹道雨并不能解释异常的地震信号.

    科学领域:

    • 行星科学 行星科学
    • 撞击石坑的动力学
    • 地震学 地震学

    背景情况:

    • 阿波罗12号任务在月球模块 (LM) 撞击时经历了一个异常的地震信号.
    • 了解撞击动态对于解释行星表面特征和地震数据至关重要.

    研究的目的:

    • 用塑料颗粒对沙子目标模拟月球模块撞击条件.
    • 为了研究火山口的形成和喷射模式.
    • 评估弹道雨对异常地震信号的贡献.

    主要方法:

    • 塑料颗粒被发射到沙子目标上,模拟阿波罗12号LM撞击条件 (发射角度4°,速度1.68公里/秒).
    • 形成的石坑被分析为形态 (浅圆或双层).
    • 研究了射出模式和下行回击影响.

    主要成果:

    • 形成了浅浅的圆或双重石坑,类似于月球石坑.
    • 分析表明,LM碎片和火山口喷射物跳过并远远撞击.
    • 观察到的弹道雨并不能完全解释异常的地震信号.

    结论:

    • 撞击实验可以复制月球石坑的特征.

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    相关实验视频

    Last Updated: Jul 12, 2026

    A Test Bed to Examine Helmet Fit and Retention and Biomechanical Measures of Head and Neck Injury in Simulated Impact
    07:30

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    Published on: August 7, 2018

  • 回击碎片 (弹道雨) 是这种冲击的结果.
  • 来自阿波罗12号LM撞击的异常地震信号需要进一步的解释,而不仅仅是弹道雨.