Is friction kinetic energy
Publish: 2021-04-23 11:35:21
1. 1, which will affect the kinetic energy
2, friction always hinders the relative motion between objects, that is to say, it always consumes the kinetic energy of objects
3, when there is external energy supplied to the object, and the energy supplied is just equal to the energy consumed by friction, the kinetic energy of the object will remain unchanged.
2, friction always hinders the relative motion between objects, that is to say, it always consumes the kinetic energy of objects
3, when there is external energy supplied to the object, and the energy supplied is just equal to the energy consumed by friction, the kinetic energy of the object will remain unchanged.
2. Mechanical energy is the sum of kinetic energy and potential energy, where potential energy is divided into gravitational potential energy and elastic potential energy. We call kinetic energy, gravitational potential energy and elastic potential energy mechanical energy. It is mass and velocity that determine kinetic energy; It is mass and height that determine gravitational potential energy; It is the stiffness coefficient and the shape variable that determine the elastic potential energy. Mechanical energy is only the sum of kinetic energy and potential energy. Mechanical energy is a physical quantity that represents the motion state and height of an object. The kinetic energy and potential energy of an object can be transformed. In the process that only kinetic energy and potential energy transform each other, the total amount of mechanical energy remains unchanged, that is, mechanical energy is conserved
for a particle system, the sum of the work done by a pair of friction forces (force and reaction) is always negative, which leads to the decrease of the mechanical energy of the system.
for a particle system, the sum of the work done by a pair of friction forces (force and reaction) is always negative, which leads to the decrease of the mechanical energy of the system.
3. The friction force is f / 4, the maximum kinetic energy is 3fs / 4
solution: let friction force be f, according to the conservation of energy: fs-4fs = 0
so f = f / 4
since only friction does negative work after removing force F, the kinetic energy at the moment of removing force is maximum
that is, EK = fs-fs = fs-fs / 4 = 3fs / 4
solution: let friction force be f, according to the conservation of energy: fs-4fs = 0
so f = f / 4
since only friction does negative work after removing force F, the kinetic energy at the moment of removing force is maximum
that is, EK = fs-fs = fs-fs / 4 = 3fs / 4
4. I always feel that there is something wrong with the premise of this problem ~
even in the ideal state, there is no case of only friction in physics, and the ideal state is not just what you want.
generally, the so-called ideal state is that there is no friction.
the change of dynamic energy is equal to the sum of work.
How can friction be proced without other forces
if it is an inclined plane, a small slider is placed on the inclined plane, and there is no external force. The inclined plane is not smooth, and the small slider slides down. Then the forces that do work are gravity and friction, and the internal energy is the final transformation of friction ~
because it is not clear what the situation is, I hope it can help you~
even in the ideal state, there is no case of only friction in physics, and the ideal state is not just what you want.
generally, the so-called ideal state is that there is no friction.
the change of dynamic energy is equal to the sum of work.
How can friction be proced without other forces
if it is an inclined plane, a small slider is placed on the inclined plane, and there is no external force. The inclined plane is not smooth, and the small slider slides down. Then the forces that do work are gravity and friction, and the internal energy is the final transformation of friction ~
because it is not clear what the situation is, I hope it can help you~
5. The conversion of friction work into internal energy is the consumption of kinetic energy. How to use friction to calculate, we should use the conservation of mechanical energy to make the equation.
6. Because friction hinders the relative motion of objects, when an object works against friction, part of its kinetic energy is converted into internal energy, and part of it is lost in the form of heat energy. So, it looks like internal energy increases and kinetic energy decreases. In fact, energy is conserved, just transforming each other.
7. 1. Kinetic
energy, potential
energy,
the combination of these two kinds of energy is mechanical
energy
2. Gravitational force, electrostatic force and elastic force are collectively called conservative force
when there is only conservative force, the mechanical energy is conserved
3. Friction, or
frictional
force, is not conservative force
we call this kind of force that consumes mechanical energy as
dissipative force
4. When it comes to the problem of partial conservative force, we can not use the law of conservation of mechanical energy, but must use the principle of function
functional principle
=
work
-
energy
principle
the functional principle is that the energy consumed by non conservative force is equal to the rection of mechanical energy
thus, the energy lost e to friction can be calculated.
energy, potential
energy,
the combination of these two kinds of energy is mechanical
energy
2. Gravitational force, electrostatic force and elastic force are collectively called conservative force
when there is only conservative force, the mechanical energy is conserved
3. Friction, or
frictional
force, is not conservative force
we call this kind of force that consumes mechanical energy as
dissipative force
4. When it comes to the problem of partial conservative force, we can not use the law of conservation of mechanical energy, but must use the principle of function
functional principle
=
work
-
energy
principle
the functional principle is that the energy consumed by non conservative force is equal to the rection of mechanical energy
thus, the energy lost e to friction can be calculated.
8. 1. Kinetic energy, potential energy,
these two kinds of energy are called mechanical energy
2. Gravitational force, electrostatic force and elastic force are collectively called conservative force
when there is only conservative force, the mechanical energy is conserved
3. Friction, or frictional force, is not a conservative force
we call this kind of mechanical energy consuming force dissipative force, which is non conservative force
4. When it comes to the problem of partial conservative force, we can not use the law of conservation of mechanical energy, but must use the principle of function
function principle = work - energy principle
the function principle is: the energy consumed by non conservative force is equal to the rection of mechanical energy
thus, the energy lost e to friction can be calculated.
these two kinds of energy are called mechanical energy
2. Gravitational force, electrostatic force and elastic force are collectively called conservative force
when there is only conservative force, the mechanical energy is conserved
3. Friction, or frictional force, is not a conservative force
we call this kind of mechanical energy consuming force dissipative force, which is non conservative force
4. When it comes to the problem of partial conservative force, we can not use the law of conservation of mechanical energy, but must use the principle of function
function principle = work - energy principle
the function principle is: the energy consumed by non conservative force is equal to the rection of mechanical energy
thus, the energy lost e to friction can be calculated.
9. You may not understand these concepts very well. They are a little confused< Key points: work is a measure of energy conversion
it means "the process of force doing work corresponds to the process of energy conversion, and the value of work is equal to the value of energy conversion"
in the kinetic energy theorem, the total work is equal to the increment (or change) of the kinetic energy of the object (unit object)
the total work refers to the algebraic sum of the work done by all the forces on the object (regardless of the concepts of energy conversion and heating). This law itself "looks" at the problem from the perspective of "work", so it is unnecessary to pay attention to the energy conversion
if we look at the problem from the perspective of "energy conversion", we don't need to pay attention to work. We can directly see which energy increases and which decreases, and then we can get the formula from the energy conservation series< However, the results are consistent. Because "the value of work" is equal to "the value of energy conversion"
for example, when the work done by sliding friction corresponds to the conversion of mechanical energy into heat energy, if the kinetic energy theorem is used to solve the problem, only the work of friction (regardless of the increased heat) is listed; if the energy conversion is used to solve the problem, only the increased heat (regardless of the work of friction) is listed.
it means "the process of force doing work corresponds to the process of energy conversion, and the value of work is equal to the value of energy conversion"
in the kinetic energy theorem, the total work is equal to the increment (or change) of the kinetic energy of the object (unit object)
the total work refers to the algebraic sum of the work done by all the forces on the object (regardless of the concepts of energy conversion and heating). This law itself "looks" at the problem from the perspective of "work", so it is unnecessary to pay attention to the energy conversion
if we look at the problem from the perspective of "energy conversion", we don't need to pay attention to work. We can directly see which energy increases and which decreases, and then we can get the formula from the energy conservation series< However, the results are consistent. Because "the value of work" is equal to "the value of energy conversion"
for example, when the work done by sliding friction corresponds to the conversion of mechanical energy into heat energy, if the kinetic energy theorem is used to solve the problem, only the work of friction (regardless of the increased heat) is listed; if the energy conversion is used to solve the problem, only the increased heat (regardless of the work of friction) is listed.
10. P and Q are subject to friction when they slide. They do not slide at the moment of elastic collision, so there is no friction. There is still friction when it continues to slide after the collision. The kinetic energy conservation series is the kinetic energy of two objects before and after the moment of collision. So conservation.
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