===> A stone or a Baseball tossed straight up.
-- Leaves your hand with speed ---> kinetic energy
-- Slows down as it sails higher ---> loses kinetic energy
-- But gains potential energy as it moves higher.
-- The kinetic energy it's losing is changing into potential energy.
-- Eventually, it stops rising, when all of its kinetic energy is gone.
-- On the way down, its potential energy turns back into kinetic energy,
until it meets the ground with a healthy 'thunk'.
Answers #1 and #2:
A rock falling off a cliff.
(When the rock is on the cliff it represents a potential energy, but when it falls off, the kinetic energy is represented by the hole formed when the rock hit the soil, but it would be a good for nothing energy)
Another example is represented by a waterfall. The water that has yet not fallen down is the potential energy. When it falls and make a turbine linked to an alternator to rotate, the kinetic energy is transformed into electricity. So, we can say that this kinetic energy is valid as a form of energy. A rock falling off from a cliff is nothing but a potential energy....because when any kind of energy isn't able to perform a useful work, it would be a useless energy, a wasted one and doesn't count as a form of energy.
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Answer #3:
The definition of Kinetic Energy is 1/2MV2. 'M' is the mass of the object,
and 'V' is its speed. Notice that the formula doesn't include any coefficient,
variable, or term of any kind that depends on whether or not the energy
accomplishes any useful purpose, or improves anyone's life. The mere fact
that a mass is moving is sufficient to establish the presence of Kinetic Energy.
As soon as the rock rolls off the edge of the cliff and begins to lose altitude,
it also begins to lose potential energy, and the steadily decreasing potential
energy is matched at every instant by its kinetic energy, as revealed by its
increasing speed as it falls. If it's moving, at any speed in any direction, then
it has kinetic energy.
When a pendulum is swinging, the energy is switched from kinetic to potential and back again twice in each cycle. Apart from the energy lost to friction that eventually stops the pendulum, the exchange of energy is a continuous process.
Throw a ball up (100% kinetic), and when it stops due to gravity, you have all that energy as (gravitational) potential.
One e.g. of potential energy changing into kenetic energy is a wind up car after it has been wound up.
Riding a bike down a hill. You gain potential energy on the way up, but on the way down you lose that potential energy and gain an equal amount of kinetic energy.
A ball being kicked with enough force to roll uphill is an example of kinetic energy turning into potential energy.
lkdnf:LDKRNG
aeroplanecoming fromair
A falling object.
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.