Always use your name for store id. It's most convenient. whenever you have some problems with product, they will ask you for id. So, its better to use real name. I often use some fictitious characters like Peter Parker, Ken Adams, etcetera while signing up on some timepass websites.
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.
Here are 5 main types of energy and examples of them. 1  mechanical energy. 2  Mechanical energy is energy that results from movement or the location of an object. 3  Mechanical energy is the sum of kinetic energy and potential energy.