Kinetic energy, rotational potential energy, rotational energy, the difference between rotational ki

Let's take vertical top-up throwing as an example.

In the process of throwing upwards, the kinetic energy decreases, the gravitational potential energy increases, and the kinetic energy is converted into gravitational potential energy. At the highest point, the kinetic energy is 0 and the gravitational potential energy is the maximum.

Due to gravity, the object starts to fall freely from the highest point, the gravitational potential energy decreases, the kinetic energy increases, and the gravitational potential energy is converted into kinetic energy in turn. When it comes to the thrown position, the gravitational potential energy is the same (the height is the same) and the kinetic energy is the same due to the conservation of mechanical energy. Energy is scalar and has no direction, and the magnitude of kinetic energy is independent of the direction of velocity.

The amount of energy converted into two energy transformations is the same, which is equivalent to how much kinetic energy is lost in the upward throwing and how much is made up when it falls. The kinetic energy does not change.

This is due to the action of force, potential energy and kinetic energy will not transform without the action of force, and the nature of force is to change the state of motion of the object, the state of motion includes the rate and direction, the direction of gravity is downward, and the object you throw upwards is naturally inconsistent.

Kinetic energy has no direction, kinetic energy only size. You're talking about a small stone in the vertical, and when you come back to the starting point at the highest point, their energy remains the same, and the direction changes but the energy does not change.

There is nothing to do with the direction of energy and velocity, which is conservation of energy.

If you want to see the change in the direction of velocity, you can use the momentum theorem.

Energy is a scalar quantity, independent of the direction of velocity, and if you want to look at the direction of velocity, you have to explain it from the point of view of momentum.

Kinetic energy is not a vector, the kinetic energy does not change, the value does not change, there is no direction.

Energy is a scalar quantity and has nothing to do with the direction of velocity.

<> kinetic energy refers to the energy possessed by an object due to motion, whereas rotational kinetic energy generally refers to the energy possessed by an object due to rotation. For a rotating wheel, on the one hand its center of mass.

In translation, on the other hand, the wheel is still rotating around the center of mass, for this specific example, the kinetic energy of the wheel rotating around the center of mass is generally called rotational kinetic energy. Kinetic energy is half of the square of the velocity of the center of mass and the mass of the object, and the moment energy is the moment of inertia.

Half of the product of the square with the angular velocity. The former is the energy that must be possessed by the movement of the center of mass, and the energy that the latter can also have if the center of mass is not in harmony or motion, and the flat body must have kinetic energy, but no rotational energy; Rotating around the center of mass of the animal body must have rotational energy, but no kinetic energy. Generally, the rotating animal body has both kinetic energy and rotational energy.

The mutual conversion of kinetic energy and potential energy of an object without considering the energy loss of the object's motion.

Take the small ball falling from a high slope as an example, at the highest point, the potential energy of the object is the maximum, the kinetic energy is zero, give the object an initial velocity, the object falls along the slope, the gravitational potential energy of the object is converted into kinetic energy, the gravitational potential energy decreases, the kinetic energy gradually increases, and when it reaches the plane, the potential energy is the smallest and the kinetic energy reaches the maximum. The overall process keeps the energy conserved.

Gravitational potential energy and kinetic energy are two different forms of energy that can be converted into each other.

Gravitational potential energy is the energy possessed by an object due to gravity, for gravitational potential energy, its magnitude is determined by the relative position of the object on the earth and the ground. The greater the mass of the object, the higher the relative position, and the more work done, thus increasing the gravitational potential energy possessed by the object.

Kinetic energy is the energy that an object has due to its mechanical motion. Kinetic energy is a scalar quantity, and there is no direction for dust picking, only size. and cannot be less than zero. Consistent with work, it can be directly added or subtracted.

Determinants

The magnitude of the gravitational potential energy of an object is determined by the magnitude of the gravitational pull of the earth on the object and the relative position of the object on the earth and the ground. The greater the mass of the object, the higher the position, and the greater the ability to do work, the more gravitational potential energy the object has.

To some extent, repentance means that when the height is constant, the greater the mass, the greater the gravitational potential energy; When the mass is constant, the higher the height, the greater the gravitational potential energy.

Conversions are conversions. In the case that the system is not subject to external forces, or the external forces do not do work on the system, the two are converted into each other, that is, the mechanical energy is conserved.

For example, if the object to be held up has (gravitational) potential energy, if it is released, it will be in free fall, the (gravitational) potential energy will decrease, the kinetic energy will increase, and the potential energy will be converted into kinetic energy.

Gravitational potential energy is converted into kinetic energy, gravitational potential energy is converted into kinetic energy, kinetic energy is converted into gravitational potential energy, and gravitational potential energy is converted into kinetic energy.

According to the principle of conservation of energy, kinetic energy and potential energy conversion is carried out in the case of ignoring the action of resistance

1. The decrease of potential energy increases the kinetic energy, and the decrease of potential energy is equal to the increase of kinetic energy.

2. The decrease of kinetic energy increases the potential energy, and the decrease of kinetic energy is equal to the increase of potential energy.

So according to the title:

1) The water is pouring down from a high place, and the water flow is getting faster and faster.

2) Ride a bicycle downhill, don't pedal pedals, and the speed of the bike is getting faster and faster.

3) High jumpers are getting slower and slower from take-off to pole crossing.

4) The process from the time the diver takes off to the time he falls into the water, the speed of the jumper is getting slower and slower when jumping upwards and the speed is getting faster and faster when he turns to the downward movement.

1. Examples are as follows.

1. When riding a bicycle downhill, the height between the bicycle and the person decreases, and the gravitational potential energy decreases; The speed increases, the kinetic energy increases, and the gravitational potential energy is converted into kinetic energy so you can speed up without pedaling.

2. After tightening the clockwork, the springwork has elastic potential energy due to elastic deformation In the process of recovery, the clockwork can drive the gear to rotate and convert the elastic potential energy into the kinetic energy of the gear.

2. Kinetic energy and gravitational potential energy can be converted into each other.

1. In the rolling test, it can be seen that the rolling pendulum rotates and descends, and the faster it turns. At its lowest point, the roll turns upward, and in the ascent it turns slower and slower until it is almost back to its original position. Then it descends and rises again, repeating the original motion.

When the pendulum falls, its gravitational potential energy becomes smaller and smaller, and the kinetic energy increases, and the gravitational potential energy is converted into kinetic energy. When the pendulum rises, its kinetic energy becomes smaller and smaller, the gravitational potential energy becomes larger and larger, and the kinetic energy is converted into gravitational potential energy.

2. Kinetic energy and elastic potential energy can be converted into each other.

After the wood ball contacts the spring sheet, the spring piece is bent (A and B), and the kinetic energy of the wood ball decreases, and the elastic potential energy of the spring sheet increases, and the kinetic energy is converted into elastic potential energy in this process. Immediately afterwards, the spring blade returns to its original shape and bounces the ball back (B C), in which the elastic potential energy is converted into kinetic energy.

When the pendulum falls, the gravitational potential energy is converted into kinetic energy, and when the pendulum rises, the kinetic energy is converted into gravitational potential energy, and the force is 0 at the highest point

In summary, the conversion of kinetic energy and potential energy is related to the change in the height of the object or the change in velocity.

Conversion of kinetic energy and gravitational potential energy.

The difference between kinetic energy and rotational kinetic energy is that when you select the reference point of the moment of inertia at the instantaneous center of velocity, that is, the fixed point, you only need to calculate the rotational kinetic energy, and the moment of inertia is relative to the fixed point. When you select the reference point for the moment of inertia at the center of the member, i.e. at the center of mass, you must add up the translational kinetic energy of the moment of inertia and the center of mass when calculating the kinetic energy.

When a rod is rotated around one end in a numerical plane, it is the gravitational potential energy that is converted into kinetic energy and rotational kinetic energy: false.

It should be that when the highest point is reached, all kinetic energy is converted into gravitational potential energy.

There are many examples of the mutual conversion of kinetic energy and potential energy, such as: when riding a bicycle downhill, the height of the bicycle and the person decreases, and the gravitational potential energy decreases; The speed increases, the kinetic energy increases, and the gravitational potential energy is converted into kinetic energy So you can speed up without pedaling After tightening the clockwork, the clockwork has elastic potential energy due to elastic deformation In the process of recovery, the clockwork can drive the gear to rotate and convert the elastic potential energy into the kinetic energy of the gear Therefore, the answer is: (1) Riding a bicycle downhill, you can also speed up without pedaling; (2) Tighten the clock's mainspring tightly, it can go for a longer time