Gravitational Potential Energy

Gravitationalpotential energy isenergy an object possesses because of its position in a gravitational field. The most common use of gravitational potential energy is for an object near the surface of the Earth where the gravitational acceleration can be assumed to be constant at about 9.8 m/s². Since thezero of gravitational potential energy can be chosen at any point (like the choice of the zero of a coordinate system), the potential energy at a height h above that point is equal to the work which would be required to lift the object to that height with no net change inkinetic energy. Since the force required to lift it is equal to itsweight, it follows that the gravitational potential energy is equal to its weight times the height to which it is lifted.

Gravitational Potential Energy

The general expression for gravitational potential energy arises from thelaw of gravity and is equal to the work done against gravity to bring a mass to a given point in space. Because of theinverse square nature of the gravity force, the force approaches zero for large distances, and it makes sense to choose thezero 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 theescape velocity from the earth's gravity.

Gravitational Potential Energy

From the work done against the gravity force in bringing a mass in from infinity where the potential energy is assigned the value zero, the expression for gravitational potential energy is

This expression is useful for the calculation ofescape velocity, energy to remove from orbit, etc. However, for objects near the earth the acceleration of gravity g can be considered to be approximately constant and the expression for potential energy relative to the Earth's surface becomes

where h is the height above the surface and g is the surface value of the acceleration of gravity.

Gravitational Potential

Gravitational Potential Integral