If you have an object on the roof it has potential energy of weight x height above the ground. When you drop it off the roof it is converted to kinetic enemy as it hits the ground, of value 1/2 its mass x velocity squared.
can be converted to potential energy.
Kinetic energy being converted to chemical potential energy
No. Other way around, yes: Niagara (or any waterfall) is an example of potential energy being changed to kinetic energy.
Since energy is ALWAYS conserved, anything that happens is an "example". For example, an object just sitting around. However, it is usually more interesting to analyze what happens when one type of energy is converted to another. For example, if a car brakes, the car's kinetic energy is converted to heat (in the brakes); when you throw an object up, kinetic energy is converted to potential energy; when it falls back down, the potential energy is converted back to kinetic energy; and if in this example there is air resistance, part of the kinetic energywill be converted to heat.
Gravitational potential energy IS mechanical energy. Mechanical energy includes both kinetic energy, and potential energy.When an object falls, gravitational potential energy will be converted to KINETIC energy.
can be converted to potential energy.
Kinetic energy being converted to chemical potential energy
If potential energy is not converted into kinetic energy (or into any other type of energy) then it remains potential. Potential energy does not expire.
It CAN be converted to kinetic energy, but it won't always do so.
Increasing the speed will increase the KINETIC energy, not the potential energy. Of course, the potential energy may eventually be converted into kinetic energy, for example if the object moves upwards.
No. Other way around, yes: Niagara (or any waterfall) is an example of potential energy being changed to kinetic energy.
Since energy is ALWAYS conserved, anything that happens is an "example". For example, an object just sitting around. However, it is usually more interesting to analyze what happens when one type of energy is converted to another. For example, if a car brakes, the car's kinetic energy is converted to heat (in the brakes); when you throw an object up, kinetic energy is converted to potential energy; when it falls back down, the potential energy is converted back to kinetic energy; and if in this example there is air resistance, part of the kinetic energywill be converted to heat.
Gravitational potential energy IS mechanical energy. Mechanical energy includes both kinetic energy, and potential energy.When an object falls, gravitational potential energy will be converted to KINETIC energy.
It is tranferred/converted into kinetic energy (DECREASES)
When a gas is heated the energy is converted to kinetic energy.
Gravitational potential energy being converted to kinetic energy
Some of its potential energy changes to kinetic energy.