When kinetic energy is 0 and when gravitational potential energy is 0

When the velocity of the object is 0, the kinetic energy is 0, and when the object has no height, the gravitational potential energy is 0The kinetic energy of the object is related to mass and velocity.

Kinetic energy: The energy that an object has due to its motion is called kinetic energy.

The specific relationship between kinetic energy and mass and velocity: kinetic energy is proportional to the square of mass and velocity, and its calculation formula is: ek.

Gravitational potential energy is the energy that an object has due to being lifted high. It's energy that's been "stored".

The characteristics of having kinetic energy are: there is height, there is mass.

The factors that affect the magnitude of gravitational potential energy are mass and height. The formula for calculating gravitational potential energy is ep mgh Similarly, when studying what is related to something, it is also necessary to "control variables", such as studying the relationship between gravitational potential energy and mass, and to control the height to a certain amount. Three sets of data are collected because the "gravitational potential energy" itself is a physical quantity that cannot be measured.

Please review this one, give specific suggestions, and don't even dare to show your face.

When the velocity is 0, the kinetic energy is zero;

Gravitational potential energy on a zero potential surface.

is 0; (Generally with the ground as the zero potential surface).

Mechanical energy. kinetic energy + potential energy; So when the sum of kinetic energy, gravitational potential energy, and elastic potential energy is 0, the mechanical energy is 0

The kinetic energy is 0 when the relative velocity is 0, and the gravitational potential energy is 0 when the relative position is 0

Gravitational potential energy is a relative quantity, if the weight is placed on the table, then the gravitational potential energy of the weight is zero relative to the tabletop, and the weight has gravitational potential energy relative to the ground! If the speed is zero, the kinetic energy will also be zero, hope!

Gravitational potential energy, kinetic energy, and elastic potential energy can be converted into another n. Any one of them can be. Can it be changed to a conversion, when is the kinetic energy 0?

The mechanical energy of the falling object is conserved. That is to say, the gravitational potential energy in the process of falling is the kinetic energy. The gravitational potential energy at the time of the start of the fall height is the sum of the mechanical energy.

When the gravitational potential energy is half of the kinetic energy. That is, in the process of conversion, the remaining gravitational potential energy is half of the potential energy converted into kinetic energy.

The remaining gravitational potential energy is rented, and can be expressed in terms of the remaining height. The potential energy converted into kinetic energy can be expressed by the height of the fall.

When the gravitational potential energy is half of the kinetic energy. The remaining height is half the height of the fall. That's one-third of the total height.

The gravitational potential energy is half of the kinetic energy, so we can assume that the gravitational potential energy is one part, the kinetic energy is two, and the total mechanical energy is three parts.

Then you can understand that the gravitational potential energy family beam has a share compared to the total mechanical energy which is equal to 1 3.

The sum of kinetic energy and potential energy is Shisen zero, indicating that the total energy of the object has not changed. Kinetic energy is the energy gained by an object due to motion, and potential energy is the energy gained by an object due to a change in position. Therefore, when the sum of the kinetic and potential energy of the object is zero, it means that the total energy of the object has not changed, that is, the total energy of the object remains the same.

This is also the basis of Newton's second law, that is, the total energy of an object is constant, that is, the sum of kinetic energy and potential energy of an object is constant, so when the sum of kinetic energy and potential energy of an object is zero, it means that the total energy of the object has not changed.

There is mechanical energy, which is 0

2.Ask this question: The teacher in the chain town should have paranoia.

3.Generally speaking, there is mechanical energy if there is mass. Moreover, the so-called potential energy and the coarse kinetic energy of the shed are both in the case of a reference frame and a zero potential energy surface

This kind of problem is usually the default ground at which the gravitational potential energy is 0.

Given that h is 10 meters, and the kinetic energy is equal to the gravitational potential energy when falling h, then mg(h h) m v 2 2

From the conservation of mechanical energy, mgh mg(h h) m v 2 2 i.e. mgh 2*mg(h h).

The distance to fall is h h 2 5 m.

Let the desired fall time be t, then H g* t 2 2 gives 5 10* t 2 2

t 1 sec.

When an object rises to its apex.

I think that the farther away from the zero potential energy surface, the greater the potential energy, and it doesn't matter whether it is positive or negative, it can only be a matter of direction.

The height is relative to another object.

When the object reaches the zero point of potential energy that you set, such as the ground, the force potential energy is all converted into kinetic energy, but the gravitational potential energy is not equal to the kinetic energy, then the gravitational potential energy is zero and the kinetic energy is maximum.

If you want the gravitational potential energy and kinetic energy to be equal, assuming that the total height is h, the gravitational potential energy and kinetic energy are equal when the object falls h.

When the object falls h, the time of the object is: 1 2gt 2=h to get t= (2h g) The velocity at this time is: 2gh

The kinetic energy is 1 2mv 2=1 2m*2gh=mgh

The gravitational potential energy is: mg(h-h)=mgh h=2h That is, when the object falls to half of the total height, the gravitational potential energy and kinetic energy are equal.

Only gravity does the work in the system for mechanical energy to be conserved. There can also be a resultant external force, but the combined external force cannot do work, otherwise the mechanical energy is not conserved. You misunderstood that formula, it's not that gravitational potential energy equals kinetic energy.

The meaning of that equation is that the decrease in the work done by gravity is equal to the increase in kinetic energy, and vice versa.

Only gravity does work, and other external forces do zero or no work.

When the block of wood moves upwards, the kinetic energy theorem.

umgh1 sina-mgh1=mgh1-(1 2)mv0 2 The height from the bottom of the inclined plane when the gravitational potential energy of the wooden block is equal to the kinetic energy h1 = the ascending phase when the wooden block moves upward, the kinetic energy theorem.

umgl-mglsina=0-(1 2)mv0 2 solves the distance of the rise on the inclined plane l=

The kinetic energy theorem when the gravitational potential energy of downward motion is equal to the kinetic energy.

mgh2-umgh2 sina = mg (lsina-h2) solution to h2=

So when the gravitational potential energy of downward motion is equal to kinetic energy, the height from the bottom of the inclined plane h3=(lsina-h2)=when the gravitational potential energy of the wooden block is equal to the kinetic energy.

Who said kinetic energy is absolute?

1. E = (1 2) MV

The velocity v is relative, so the magnitude of the kinetic energy is also relative. For example, the passengers sitting in the moving train, the luggage on the luggage rack, and the train itself have kinetic energy relative to the ground; But the velocity of any one of them is zero relative to the other, so one of them has no kinetic energy relative to the other.

2. What is the potential energy of 0, and the potential energy cannot be 0? The meaning is unclear.

Potential energy e potential = mgh, where h refers to the height of the position of the object with respect to the 0 reference surface, and when h = 0, e potential = 0. For example, an object placed on a tabletop has a potential energy that is not zero relative to the ground, but zero with respect to the tabletop.

For example, gravitational potential energy is the energy due to height, and the position relationship is a problem. Need to select the reference zero potential surface! It can only be said that an object has potential energy with respect to the selected reference zero potential surface.

Relative! Motion is also absolute, rest is relative, everything is in constant motion, and there is no absolute zero kinetic energy. Only the relative velocity is zero.

Because absolute values have a nadir point, while constants do not.

If the gravitational force does positive work on the object from the zero potential energy side upwards (the gravitational potential energy of the object decreases), then the gravitational potential energy is negative from the zero potential energy side upward; If gravity does negative work on the object (the gravitational potential energy of the object increases), then the gravitational potential energy is positive from the zero potential energy aspect.

The choice of zero potential energy reference point is only for the convenience of research, and the choice of ground as a zero potential surface can also be said to be a habit, no matter how you choose, the final result will definitely be the same.

Potential energy is a latent energy that can also be considered to be a danger that has the power to do something (imagine if a heavy object was hanging over your head, would you worry about it falling and hitting your head?). ), but there will be no such danger with heavy objects on the ground! Therefore, it makes sense to choose the ground as the zero reference surface.

The gravitational potential energy of an object at infinity is infinite.

Of course, you can also take infinity as the zero point, then the gravitational potential energy is negative. You can deduce it yourself and try it ...

There are positive and negative electric potential energy, and there are many forms of electric fields, such as charge electric field, vortex electric field, parallel plate electric field, etc., which are much more complex than gravitational potential energy. The electric charge field is similar to the gravitational field, and the two have certain things in common.

If the object is above the zero potential energy surface, its gravitational potential energy is positive; Below the zero potential energy surface, the gravitational potential energy is negative. When gravity does positive work, the gravitational potential energy decreases; When gravity does negative work, the gravitational potential energy increases.