问题描述：
关于gravitational potential energy 的理解
Gravitational Potential Energy
The general expression for gravitational potential energy arises from the law of gravity and is equal to the work done against gravity to bring a mass to a given point in space.
Because of the inverse square nature of the gravity force,the force approaches zero for large distances,and it makes sense to choose the zero of gravitational potential energy at an infinite distance away.
The gravitational potential energy near a planet is then negative,since gravity does positive work as the mass approaches.
This negative potential is indicative of a "bound state"; once a mass is near a large body,it is trapped until something can provide enough energy to allow it to escape.
The general form of the gravitational potential energy of mass m is:
where G is the gravitation constant,M is the mass of the attracting body,and r is the distance between their centers.
This is the form for the gravitational potential energy which is most useful for calculating the escape velocity from the earth's gravity.
不知道第二句中提到的"inverse square nature of gravity force"和下面的解释是怎么理解的?
Gravitational Potential Energy
The general expression for gravitational potential energy arises from the law of gravity and is equal to the work done against gravity to bring a mass to a given point in space.
Because of the inverse square nature of the gravity force,the force approaches zero for large distances,and it makes sense to choose the zero of gravitational potential energy at an infinite distance away.
The gravitational potential energy near a planet is then negative,since gravity does positive work as the mass approaches.
This negative potential is indicative of a "bound state"; once a mass is near a large body,it is trapped until something can provide enough energy to allow it to escape.
The general form of the gravitational potential energy of mass m is:
where G is the gravitation constant,M is the mass of the attracting body,and r is the distance between their centers.
This is the form for the gravitational potential energy which is most useful for calculating the escape velocity from the earth's gravity.
不知道第二句中提到的"inverse square nature of gravity force"和下面的解释是怎么理解的?
问题解答：
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