True or False Kinetic energy is stored energy?

Answer 1

The question is too vague: work done on what? Kinetic energy of what? If you mean: "is the work done on a body equivalent to the kinetic energy of that body?" then the answer is "in some cases it is, but in general it is not".

Generally, the work done by a force on a body equals the change in total mechanical energy of that body (this is called the work-energy theorem). The total mechanical energy of a body is equal to the sum of its kinetic energy and its potential energy. Potential energy is only relevant when the body is under the influence of what is called a conservative force, such as gravity.

We can express the work-energy theorem mathematically as follows:

KE1 + PE1 + W = KE2 + PE2 (Eq. 1)

Where W is the work done on the body under consideration, KE and PE represent kinetic energy and potential energy, respectively, of that body - and the subscripts 1 and 2 refer to the states just before and just after the work was done on the body.

If we picture a body that is far removed from any massive object (i.e., there is no significant gravity or any other conservative force field acting on the body), and we say furthermore that it is initially at rest with respect to our frame of reference, then we may set KE1, PE1, and PE2 equal to zero. Eq. 1 now becomes:

W = KE2

Or:

F d = 1/2 m v2

Where d is the distance over which force F acts, and m and v are the body's mass and velocity, respectively. Thus, in this case, work done does indeed equal the body's final kinetic energy. Remember, though, that this is only true in a special case, where simplifying assumptions have been made (no gravity, body initially at rest). Eq. 1, the general form of the work-energy theorem, generally holds in classical mechanics.

Answer 2

your question is to be answered accordingly. let me give you an eg.: a free falling object has potential energy max. but to its mid way both potential & kinetic energy are equal then slowly its kinetic energy increases & potential energy decreases.

but if force & displacement are equal then both are same at certain height

Answer 3

none of them is a measure of work.

work is equal to a force crossed into a distance or W = Fxd

potential and kinetic energy are all forms of energy, and total energy is equal to PE + KE + UE (internal energy) - friction.

if you are working with scalars (direction is not important) work is simply force times distance

if you look at the units, they are all in joules, but potential energy is merely a measure of how much energy is stored in an object where as kinetic energy is a measure of how much energy an object in motion contains at a given point in time.

so technically, neither is a measure of work.

if you were to take the momentum of the object, multiplied it by the distance it traveled, and divided it by the time it took to travel that distance, you would get the work produced by the object.

Answer 4

Yes because kinetic means movement energy and that enables something to do work.

Answer 5

Kinetic energy is due to movement so it is mechanical. Potential energy is different and in mechanical terms it is due to gravity, or elasticity of a material, like a spring or rubber band

Answer 6

Not entirely; work may be equal to a change in any type of energy.

Answer 7

False, it is potential energy

Answer 8

True

Answer 9

True

Answer 10

Is true