How do you compare the magnitude of mechanical energy of an object?

What you're talking about is that at the beginning of the release, the two balls are at the same height (when the rope is horizontal).

Since the position of the two balls is equal at the beginning, and they have equal mass, their gravitational potential energy is equal; And because when they are just released, their velocity is equal to 0, that is, the kinetic energy is equal to 0, so their mechanical energy is equal.

In the future, during their motion, their respective mechanical energies are conserved, so their mechanical energies are the same.

Because before release, the two balls are at one height (released horizontally from the horizontal direction), at which point their mechanical energy is equal. When they start to oscillate, they are only subjected to gravity and elastic force, and the mechanical energy is conserved. In this way, no matter which position they swing to, their mechanical energy is equal to the mechanical energy before release, so that two small balls of different lengths have the same mechanical energy.

The two balls must have been released from the same height

Because the mass of the two balls is the same, the initial release is that the kinetic energy of both balls is 0, and the gravitational potential energy is the same (the mass and height are the same).

Both: the mechanical energy is the same, but in the process of falling the ball, it is only affected by gravity, that is to say, the mechanical energy is conserved during the fall.

The mechanical energy of both balls is always the same.

Glad for your question.

Firstly, mechanical energy e = ep (potential energy) + ek (kinetic energy) where potential energy includes gravitational potential energy and elastic potential energy.

And in the hem process, the mechanical energy of the small ball is conserved (about this point, you can look at the high school physics compulsory 2) that is, the mechanical energy of the two small balls has always been unchanged, and when it is not released at the beginning, the two small balls are at the same height and have the same mass, so the gravitational potential energy is the same. At this time, the velocity of the ball is 0, so the kinetic energy is 0

Therefore, the mechanical energy of the two balls is always the same, as well as when swinging in the vertical direction.

In the beginning, the two balls have the same mass, the same height, and the same mechanical energy. 1

After release, the ball is ideally not worked by forces other than gravity, so the mechanical energy is conserved. 2

So the mechanical energy of the two balls is the same.

Kinetic energy + potential energy, whose sum is greater, the mechanical energy is greater.

Mechanical energy is related to the speed, mass, height, and degree of deformation of the object.

Mechanical energy is divided into kinetic energy and potential energy, the magnitude of kinetic energy is related to the velocity and mass of the object, potential energy is divided into gravitational potential energy and elastic potential energy, the magnitude of gravitational potential energy is related to the mass of the object and the height of being lifted, and the magnitude of elastic potential energy is related to the mass of the object and the degree of elastic deformation. Internal energy is related to the thermal motion of molecules and intermolecular interactions. Bright dust rises.

When the mass of the object is the same, the greater the velocity of the object, the greater the kinetic energy.

When the object is moving at the same velocity, the greater the mass of the object, the greater the kinetic energy.

Mechanical energy is related to mass, velocity, height, and stiffness coefficient, among others. Mechanical energy is the sum of kinetic energy and potential grip energy, and here potential energy is divided into gravitational potential energy and elastic potential energy. Mechanical energy is a physical quantity that represents the state and height of an object.

We refer to kinetic energy, gravitational potential energy, and elastic potential energy collectively as mechanical energy. It is mass and velocity that determine kinetic energy; It is the mass and height that determine the gravitational potential energy; The elastic potential energy is determined by the stiffness coefficient and the deformation. Mechanical energy is simply the sum of kinetic energy and potential energy.

In addition to gravity, the force other than the elastic force of the spring does positive work on the object, and the mechanical energy of the object increases; When a force other than gravity and the elastic force of a spring does negative work on the object, the mechanical energy of the object decreases. If the sum of the work done by forces other than the heavy physical force and elastic force is zero, the mechanical energy remains unchanged.

In an object system where only gravity or elastic force does work (or without the action of other external forces), the kinetic energy and potential energy (including gravitational potential energy and elastic potential energy) of the object system are converted into each other, but the total energy of the mechanical energy remains the same. This law is called the law of conservation of mechanical energy.

First of all, there should be no relationship between the two. As.

1] A steel ball with a temperature of room temperature, its motion speed is 200m s, its mechanical energy is very large, but the internal energy is small, such a steel ball has a great impact force;

2] The same steel ball, but its velocity is 0 (not considering potential energy), but its temperature is 1400, at this time, its mechanical energy is small (should be 0), but its internal energy is very large, such a steel ball can do work by releasing heat (that is, the internal energy can also be converted into mechanical energy).

2] The same steel ball as above, but at this time its velocity is 200 (without considering potential energy) and its temperature is 1400, at this time, its energy is obviously stronger than the first two: not only its mechanical energy is large, but its internal energy is also very large.

This fully shows that the magnitude of the internal energy of an object is not the same thing as the magnitude of its mechanical energy.

Second, if it is a definite object (especially a solid, the fluid should also consider the pressure energy), without considering the loss, its "internal energy + mechanical energy = constant", i.e.

U+1 2(CF2)+G Z=constant (the equation for the conservation of energy at this time 1kg).

Description: The first term is the internal energy, the second term is the kinetic energy, and the third term is the potential energy. As.

A rigid body ball moving at high speed, when it hits an object (assuming the object is not moving), the ball can convert its kinetic energy into internal energy (manifested as an increase in the temperature of the ball).In particular, if an asteroid hits a geographically prepared ball, it will generate a lot of heat.

So, in general, the internal energy of an object, which is disordered and determined by its state parameters, is an intrinsic form of energy. Whereas, mechanical energy is macroscopic and orderly, and the magnitude of its energy must be determined by external coordinates.

Mechanical energy is related to the speed, mass, height, and degree of deformation of the object.

Mechanical energy is divided into kinetic energy and potential energy, the magnitude of kinetic energy is related to the velocity and mass of the object, potential energy is divided into gravitational potential energy and elastic potential energy, the magnitude of gravitational potential energy is related to the mass of the object and the height of being lifted, and the magnitude of elastic potential energy is related to the mass of the object and the degree of elastic deformation. Internal energy is related to the thermal motion of molecules and intermolecular interactions. Bright dust rises.

When the mass of the object is the same, the greater the velocity of the object, the greater the kinetic energy.

When the object is moving at the same velocity, the greater the mass of the object, the greater the kinetic energy.

Look at kinetic energy and gravitational potential energy respectively, or see if there is other energy converted into mechanical energy or mechanical energy converted into other energy.

Work done by external force = amount of mechanical energy change.

Judging the work done by the combined external force, if it is positive work, the mechanical energy increases, if it is negative work, the mechanical energy decreases The kinetic energy decreases, because ek=1 2mv 2, v does not change, m decreases].

Look at whether the force other than gravity does positive or negative work].