🗊Презентация Work, energy and power. Conservation of energy. Linear momentum. Collisions

Категория: Физика
Нажмите для полного просмотра!
Work, energy and power. Conservation of energy. Linear momentum. Collisions, слайд №1Work, energy and power. Conservation of energy. Linear momentum. Collisions, слайд №2Work, energy and power. Conservation of energy. Linear momentum. Collisions, слайд №3Work, energy and power. Conservation of energy. Linear momentum. Collisions, слайд №4Work, energy and power. Conservation of energy. Linear momentum. Collisions, слайд №5Work, energy and power. Conservation of energy. Linear momentum. Collisions, слайд №6Work, energy and power. Conservation of energy. Linear momentum. Collisions, слайд №7Work, energy and power. Conservation of energy. Linear momentum. Collisions, слайд №8Work, energy and power. Conservation of energy. Linear momentum. Collisions, слайд №9Work, energy and power. Conservation of energy. Linear momentum. Collisions, слайд №10Work, energy and power. Conservation of energy. Linear momentum. Collisions, слайд №11Work, energy and power. Conservation of energy. Linear momentum. Collisions, слайд №12Work, energy and power. Conservation of energy. Linear momentum. Collisions, слайд №13Work, energy and power. Conservation of energy. Linear momentum. Collisions, слайд №14Work, energy and power. Conservation of energy. Linear momentum. Collisions, слайд №15Work, energy and power. Conservation of energy. Linear momentum. Collisions, слайд №16Work, energy and power. Conservation of energy. Linear momentum. Collisions, слайд №17Work, energy and power. Conservation of energy. Linear momentum. Collisions, слайд №18Work, energy and power. Conservation of energy. Linear momentum. Collisions, слайд №19Work, energy and power. Conservation of energy. Linear momentum. Collisions, слайд №20Work, energy and power. Conservation of energy. Linear momentum. Collisions, слайд №21Work, energy and power. Conservation of energy. Linear momentum. Collisions, слайд №22Work, energy and power. Conservation of energy. Linear momentum. Collisions, слайд №23Work, energy and power. Conservation of energy. Linear momentum. Collisions, слайд №24Work, energy and power. Conservation of energy. Linear momentum. Collisions, слайд №25Work, energy and power. Conservation of energy. Linear momentum. Collisions, слайд №26Work, energy and power. Conservation of energy. Linear momentum. Collisions, слайд №27Work, energy and power. Conservation of energy. Linear momentum. Collisions, слайд №28Work, energy and power. Conservation of energy. Linear momentum. Collisions, слайд №29Work, energy and power. Conservation of energy. Linear momentum. Collisions, слайд №30Work, energy and power. Conservation of energy. Linear momentum. Collisions, слайд №31Work, energy and power. Conservation of energy. Linear momentum. Collisions, слайд №32Work, energy and power. Conservation of energy. Linear momentum. Collisions, слайд №33Work, energy and power. Conservation of energy. Linear momentum. Collisions, слайд №34
Скачать
Вы можете ознакомиться и скачать презентацию на тему Work, energy and power. Conservation of energy. Linear momentum. Collisions. Доклад-сообщение содержит 34 слайдов. Презентации для любого класса можно скачать бесплатно. Если материал и наш сайт презентаций Mypresentation Вам понравились – поделитесь им с друзьями с помощью социальных кнопок и добавьте в закладки в своем браузере.

Слайды и текст этой презентации

Слайд 1


Physics 1 Voronkov Vladimir Vasilyevich
Описание слайда:
Physics 1 Voronkov Vladimir Vasilyevich

Слайд 2


Lecture 3 Work, energy and power Conservation of energy Linear momentum. Collisions.
Описание слайда:
Lecture 3 Work, energy and power Conservation of energy Linear momentum. Collisions.

Слайд 3


Work A force acting on an object can do work on the object when the object moves.
Описание слайда:
Work A force acting on an object can do work on the object when the object moves.

Слайд 4


Work, energy and power. Conservation of energy. Linear momentum. Collisions, слайд №4
Описание слайда:

Слайд 5


Work Units Work is a scalar quantity, and its units are force multiplied by length. Therefore, the SI unit of work is the newton • meter (N • m). This combination of units is used so frequently that it has been given a name of its own: the joule ( J).
Описание слайда:
Work Units Work is a scalar quantity, and its units are force multiplied by length. Therefore, the SI unit of work is the newton • meter (N • m). This combination of units is used so frequently that it has been given a name of its own: the joule ( J).

Слайд 6


Work done by a varying force
Описание слайда:
Work done by a varying force

Слайд 7


Work, energy and power. Conservation of energy. Linear momentum. Collisions, слайд №7
Описание слайда:

Слайд 8


Work done by a spring If the spring is either stretched or compressed a small distance from its unstretched (equilibrium) configuration, it exerts on the block a force that can be expressed as
Описание слайда:
Work done by a spring If the spring is either stretched or compressed a small distance from its unstretched (equilibrium) configuration, it exerts on the block a force that can be expressed as

Слайд 9


Work, energy and power. Conservation of energy. Linear momentum. Collisions, слайд №9
Описание слайда:

Слайд 10


Work, energy and power. Conservation of energy. Linear momentum. Collisions, слайд №10
Описание слайда:

Слайд 11


Work of a spring So the work done by a spring from one arbitrary position to another is:
Описание слайда:
Work of a spring So the work done by a spring from one arbitrary position to another is:

Слайд 12


Kinetic energy Work is a mechanism for transferring energy into a system. One of the possible outcomes of doing work on a system is that the system changes its speed. Let’s take a body and a force acting upon it: Using Newton’s second law, we can substitute for the magnitude of the net force and then perform the following chain-rule manipulations on the integrand:
Описание слайда:
Kinetic energy Work is a mechanism for transferring energy into a system. One of the possible outcomes of doing work on a system is that the system changes its speed. Let’s take a body and a force acting upon it: Using Newton’s second law, we can substitute for the magnitude of the net force and then perform the following chain-rule manipulations on the integrand:

Слайд 13


And finally: This equation was generated for the specific situation of one-dimensional motion, but it is a general result. It tells us that the work done by the net force on a particle of mass m is equal to the difference between the initial and final values of a quantity
Описание слайда:
And finally: This equation was generated for the specific situation of one-dimensional motion, but it is a general result. It tells us that the work done by the net force on a particle of mass m is equal to the difference between the initial and final values of a quantity

Слайд 14


Work-energy theorem: In the case in which work is done on a system and the only change in the system is in its speed, the work done by the net force equals the change in kinetic energy of the system. This theorem is valid only for the case when there is no friction.
Описание слайда:
Work-energy theorem: In the case in which work is done on a system and the only change in the system is in its speed, the work done by the net force equals the change in kinetic energy of the system. This theorem is valid only for the case when there is no friction.

Слайд 15


Conservative and Nonconcervative Forces Forces for which the work is independent of the path are called conservative forces. Forces for which the work depends on the path are called nonconservative forces The work done by a conservative force in moving an object along any closed path is zero.
Описание слайда:
Conservative and Nonconcervative Forces Forces for which the work is independent of the path are called conservative forces. Forces for which the work depends on the path are called nonconservative forces The work done by a conservative force in moving an object along any closed path is zero.

Слайд 16


Examples Conservative Forces: Spring central forces Gravity Electrostatic forces Nonconcervative Forces: Various kinds of Friction
Описание слайда:
Examples Conservative Forces: Spring central forces Gravity Electrostatic forces Nonconcervative Forces: Various kinds of Friction

Слайд 17


Gravity is a conservative force: Gravity is a conservative force:
Описание слайда:
Gravity is a conservative force: Gravity is a conservative force:

Слайд 18


Friction is a nonconcervative force:
Описание слайда:
Friction is a nonconcervative force:

Слайд 19


Power Power P is the rate at which work is done:
Описание слайда:
Power Power P is the rate at which work is done:

Слайд 20


Potential Energy Potential energy is the energy possessed by a system by virtue of position or condition. We call the particular function U for any given conservative force the potential energy for that force. Remember the minus in the formula above.
Описание слайда:
Potential Energy Potential energy is the energy possessed by a system by virtue of position or condition. We call the particular function U for any given conservative force the potential energy for that force. Remember the minus in the formula above.

Слайд 21


Work, energy and power. Conservation of energy. Linear momentum. Collisions, слайд №21
Описание слайда:

Слайд 22


Potential Energy of Gravity
Описание слайда:
Potential Energy of Gravity

Слайд 23


Conservation of mechanical energy E = K + U(x) = ½ mv2 + U(x) is called total mechanical energy If a system is isolated (no energy transfer across its boundaries) having no nonconservative forces within then the mechanical energy of such a system is constant.
Описание слайда:
Conservation of mechanical energy E = K + U(x) = ½ mv2 + U(x) is called total mechanical energy If a system is isolated (no energy transfer across its boundaries) having no nonconservative forces within then the mechanical energy of such a system is constant.

Слайд 24


Linear momentum Let’s consider two interacting particles: and their accelerations are: using definition of acceleration: masses are constant:
Описание слайда:
Linear momentum Let’s consider two interacting particles: and their accelerations are: using definition of acceleration: masses are constant:

Слайд 25


So the total sum of quantities mv for an isolated system is conserved – independent of time. This quantity is called linear momentum.
Описание слайда:
So the total sum of quantities mv for an isolated system is conserved – independent of time. This quantity is called linear momentum.

Слайд 26


General form for Newton’s second law: It means that the time rate of change of the linear momentum of a particle is equal to the net for force acting on the particle. The kinetic energy of an object can also be expressed in terms of the momentum:
Описание слайда:
General form for Newton’s second law: It means that the time rate of change of the linear momentum of a particle is equal to the net for force acting on the particle. The kinetic energy of an object can also be expressed in terms of the momentum:

Слайд 27


The law of linear momentum conservation The sum of the linear momenta of an isolated system of objects is a constant, no matter what forces act between the objects making up the system.
Описание слайда:
The law of linear momentum conservation The sum of the linear momenta of an isolated system of objects is a constant, no matter what forces act between the objects making up the system.

Слайд 28


Impulse-momentum theorem The impulse of the force F acting on a particle equals the change in the momentum of the particle. Quantity is called the impulse of the force F.
Описание слайда:
Impulse-momentum theorem The impulse of the force F acting on a particle equals the change in the momentum of the particle. Quantity is called the impulse of the force F.

Слайд 29


Collisions Let’s study the following types of collisions: Perfectly elastic collisions: no mass transfer from one object to another Kinetic energy conserves (all the kinetic energy before collision goes to the kinetic energy after collision) Perfectly inelastic collisions: two objects merge into one. Maximum kinetic loss.
Описание слайда:
Collisions Let’s study the following types of collisions: Perfectly elastic collisions: no mass transfer from one object to another Kinetic energy conserves (all the kinetic energy before collision goes to the kinetic energy after collision) Perfectly inelastic collisions: two objects merge into one. Maximum kinetic loss.

Слайд 30


Perfectly elastic collisions We can write momentum and energy conservation equations: (1) (2) (1)=> (3) (2)=> (4) (4)/(3): (5)
Описание слайда:
Perfectly elastic collisions We can write momentum and energy conservation equations: (1) (2) (1)=> (3) (2)=> (4) (4)/(3): (5)

Слайд 31


Denoting We can obtain from (5) Here Ui and Uf are initial and final relative velocities. So the last equation says that when the collision is elastic, the relative velocity of the colliding objects changes sign but does not change magnitude.
Описание слайда:
Denoting We can obtain from (5) Here Ui and Uf are initial and final relative velocities. So the last equation says that when the collision is elastic, the relative velocity of the colliding objects changes sign but does not change magnitude.

Слайд 32


Perfectly inelastic collisions
Описание слайда:
Perfectly inelastic collisions

Слайд 33


Energy loss in perfectly inelastic collisions
Описание слайда:
Energy loss in perfectly inelastic collisions

Слайд 34


Units in SI Work,Energy W,E J=N*m=kg*m2/s2 Power P J/s=kg*m2/s3 Linear momentum p kg*m/s
Описание слайда:
Units in SI Work,Energy W,E J=N*m=kg*m2/s2 Power P J/s=kg*m2/s3 Linear momentum p kg*m/s

Скачать

Похожие презентации
Mypresentation.ru
Загрузить презентацию