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السنة التحضيرية للعام الجامعي 1433هـ هـ الدكتورة/سميرة القحطاني

Published byBuck Lawson Modified over 6 years ago

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Presentation on theme: "السنة التحضيرية للعام الجامعي 1433هـ هـ الدكتورة/سميرة القحطاني"— Presentation transcript:

1 السنة التحضيرية للعام الجامعي 1433هـ - 1434هـ الدكتورة/سميرة القحطاني
الفيزياء العامة مقرر 110 السنة التحضيرية للعام الجامعي 1433هـ هـ تنفيذ الدكتورة/سميرة القحطاني استاذ مساعد

2 Fundamentals of Physics
8th Edition HALLIDAY * RESNICK

3 Kinetic Energy and Work
Ch-7 Kinetic Energy and Work الطاقة الحركية والشغل

4 في هذا الفصل سوف نركز على دراسة
only one way in which energy can be transferred (Work) only one type of energy Kinetic energy

5 Nature of Energy Living organisms need energy for growth and movement.
You use energy when you: hit a softball. lift your book bag. compress a spring. Living organisms need energy for growth and movement. Energy is involved when: a bird flies. a bomb explodes. rain falls from the sky. electricity flows in a wire.

6 Properties of Energy .If the energy transformed and transferred
- Energy is measured in the same units as work Energy can be transformed from one type to another .If the energy transformed and transferred we find that the total amount is always the same (energy is conserved ). - Energy is a scalar quantity

7 Forms of Energy Thermal Energy Electrical Energy Chemical Energy
Radiant Energy Thermal Energy Electrical Energy Chemical Energy Nuclear Energy Mechanical Energy Magnetic Energy

8 Kinetic Energy is the energy of motion.
Potential Energy is stored energy. Potential energy + Kinetic energy = Mechanical energy

9 Kinetic Energy Kinetic energy is energy associated with the state of motion of an object The faster the object moves , the greater is its kinetic energy . When the object is stationary , its kinetic energy is zero . K ( kinetic energy ) is Scalar quantity .

10

11

12 في هذا الفصل سوف نركز على دراسة
only one type of energy Kinetic energy only one way in which energy can be transferred (Work)

13 Where is the angel between the direction of the displacement and the force
F = 5 i j + 2k d = 2 i j - k W=

14 Properties of Work Unite Joule Positive work + W
Energy transferred to the object Work is a scalar quantity Positive work + W Unite Joule Energy transferred from the object negative work - W

15 Work and Kinetic Energy Work done by an External Force

16 Work – kinetic energy theorem

17 انواع الشغل The force dose zero on the object
The force dose positive work on the object The force dose negative work on the object When it has vector component perpendicular as the displacement When it has a vector component in the same direction as the displacement When it has a vector component in the opposite direction as the displacement

18 امثلة لتوضيح نوع الشغل A B F d C Ø=0 القوة نفس اتجاة الازاحة
القوة عكس اتجاة الازاحة F d C القوة عمودية على اتجاة الازاحة Ø=0

19

20 الشغل يكون سالب لانها بدات من 4.5 وانتهت الى 2 اذن الطاقة الحركية قلت
a) الشغل يكون سالب لانها بدات من وانتهت الى 2 اذن الطاقة الحركية قلت

21 b)

22 c) الشغل هنا سالب الشغل هنا صفر

23 Methods for calculating work work done by f1 + work done by f2
work done by Fnet work done by f1 + work done by f2

24 FN F2=10N F1=20N Fg 30 40

25 FN F2=10N F1=20N Fg 30 40

26 a) Work done by : Work done by : Total work done :

27 (b)  During the displacement, what is the work Wg done on the safe by the gravitational force and what is the work WN done on the safe by the normal force from the floor?

28 We have assumed no frictional forces exist.
(c)  The safe is initially stationary. What is its speed vf at the end of the 8.50 m displacement? Work done on object equals increase in kinetic energy : We have assumed no frictional forces exist.

29

30 Work done by the wind force on crate :
(a)  How much work does this force from the wind do on the crate during the displacement? Work done by the wind force on crate : The wind force does negative work, i.e. kinetic energy is taken out of the crate.

31 (b)  If the crate has a kinetic energy of 10 J at the beginning of displacement , what is its kinetic energy at the end of ?

32 امثلة وتطبيقات 5kg Q.1

33 Q.2

34 Q.3

35 Q.4

36 Q.5

37 Q.6

38 Q.7

39 Q.8

40 ملاحظاااااااااات هااااااااااااااااااااااااااااااامة

41

42

43 بعض المصطلحات الموجودة في Ch7
المصطلح العلمي (انجليزى) المصطلح العلمي(العربي) Kinetic Energy and Work الطاقة الحركية والشغل Energ الطاقة energy is conserved حفظ الطاقة principle مبدا Kinetic energy الطاقة الحركية Work الشعل transferred تحويل او نقل

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