Work, energy and power. Conservation of energy. Linear momentum. Collisions презентация
Содержание
- 2. Lecture 3 Work, energy and power Conservation of energy
- 3. Work A force acting on an object can do work on
- 5. Work Units Work is a scalar quantity, and its units are
- 6. Work done by a varying force
- 8. Work done by a spring If the spring is either stretched
- 11. Work of a spring So the work done by a spring
- 12. Kinetic energy Work is a mechanism for transferring energy into a
- 13. And finally: This equation was generated for the specific situation of
- 14. Work-energy theorem: In the case in which work is done on
- 15. Conservative and Nonconcervative Forces Forces for which the work is independent
- 16. Examples Conservative Forces: Spring central forces Gravity Electrostatic forces Nonconcervative
- 17. Gravity is a conservative force: Gravity is a conservative force:
- 18. Friction is a nonconcervative force:
- 19. Power Power P is the rate at which work is done:
- 20. Potential Energy Potential energy is the energy possessed by a system
- 22. Potential Energy of Gravity
- 23. Conservation of mechanical energy E = K + U(x) = ½
- 24. Linear momentum Let’s consider two interacting particles: and their accelerations
- 25. So the total sum of quantities mv for an isolated system
- 26. General form for Newton’s second law: It means that the time
- 27. The law of linear momentum conservation The sum of the linear
- 28. Impulse-momentum theorem The impulse of the force F acting on a
- 29. Collisions Let’s study the following types of collisions: Perfectly elastic collisions:
- 30. Perfectly elastic collisions We can write momentum and energy conservation equations:
- 31. Denoting We can obtain from (5) Here Ui and Uf are
- 32. Perfectly inelastic collisions
- 33. Energy loss in perfectly inelastic collisions
- 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
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