Potential energy is basically that which hasn't really done anything yet. It's energy that is stored - like in a battery. It is energy that can still take or be converted into other forms. See the link below, for more details.
It isn't clear what you mean with "he", but an object's gravitational potential energy is greatest at its highest position.
When the pendulum is at its highest point or amplitude, it has the highest potential energy. When it passes by its point of equilibriu, it has the highest kinetic energy.
Whoever is the higher.
It's kinetic energy is highest when it is about half way to the top. The gravitational potential energy is highest when it is about to fall back down.
at both ends of the swing, where the bob is the highest
It isn't clear what you mean with "he", but an object's gravitational potential energy is greatest at its highest position.
When the roller coaster is at its highest position and is not moving then its potential energy is highest
When the roller coaster is at its highest position and is not moving then its potential energy is highest
When the roller coaster is at its highest position and is not moving then its potential energy is highest
It isn't clear what you mean by "it". In the case of gravitational potential energy, it is greatest when an object is at its highest position (or when two objects are furthest apart). For other types of potential energy, the situation is different.
The electrons have the highest potential energy in a photexcited P700
-- If you're talking about a pendulum, then the potential energy is highest and kinetic energy is zero at the ends of the swing, and potential energy is lowest and kinetic energy is highest in the middle of the swing. -- If you're not talking about a pendulum, then the preceding may be completely wrong.
When the pendulum is at its highest point or amplitude, it has the highest potential energy. When it passes by its point of equilibriu, it has the highest kinetic energy.
As the swing moves, potential energy changes into kinetic energy. At the highest position all energy is gravitational potential energy as the swing has stopped at its highest position. Then the energy is converted back to kinetic energy, KE as it descends.
Whoever is the higher.
At it's highest point where it begins to come back down. It has 0 kinetic energy, so that is when it has the most potential.
Yes, a falling object has only potential energy at its highest point at rest. The same object will also have all kinetic energy and no potential energy the instant just before striking the ground at its highest velocity at ground level.