Force class 6.pptx

Class 6 physics, chapter force, 3 lectures in total for teaching purpose

1. FORCE LECTURE-1

2. State of Rest

3. A body is said to be at rest if it does not change its position with time with respect to its surroundings.

4. State of Motion

5. A body is said to be in the state of motion if it changes its position with time with respect to its surroundings.

6. PUSH PULL

7. LECTURE-2

8. Topics we covered in previous class State of Rest State of motion Push and Pull

9. Topics we will cover today Understanding what is Force and its definition Effects of Force Types of Forces

10. Quick revesion

11. State of Rest

12. A body is said to be at rest if it does not change its position with time with respect to its surroundings.

13. State of Motion

14. A body is said to be in the state of motion if it changes its position with time with respect to its surroundings.

15. PULL PUSH

16. Stretch Squeze

17. Definition of Force Force is a cause (a push, pull, stretch or squeeze) which changes or tends to change the state of rest or the state of uniform motion, or direction of motion, or the shape and size of a body.

18. Formula of Force The formula of force is defined by Newton's second law of motion: Force exerted by an object equals mass times acceleration of that object:   F = m ⨉ a. 

19. Units of Force

20. Effects of Force A force can change the shape or size of an object

21. 2. A force can make a stationary object move.

22. 3. A force can change the speed of a moving object

23. 4. A force can change the direction of a moving object

24. 5. A force can stop a moving object

25. Types of Force

26. CONTACT FORCES 1. Normal reaction Force Every action has an equal and opposite reaction

27. 2. Tension

28. 3. Muscular Force

29. 4. Collision Force

30. 5. Frictional Force

31. Reducing Frictional Force

32. Reducing Frictional Force

33. NON-Contact Forces 1. Magnetic Force

34. NON-Contact Forces 1. Magnetic Force

35. 2. Electrostatic Force

36. 3. Gravitational Force

37. Topics we covered today Understanding what is Force and its definition Effects of Force Types of Forces

38. LECTURE-3

39. Topics we covered in previous class Understanding what is Force and its definition Effects of Force Types of Forces

40. Quick revesion

41. Stretch Squeze

42. Definition of Force Force is a cause (a push, pull, stretch or squeeze) which changes or tends to change the state of rest or the state of uniform motion, or direction of motion, or the shape and size of a body.

43. Units of Force

44. Effects of Force A force can change the shape or size of an object

45. 2. A force can make a stationary object move.

46. 3. A force can change the speed of a moving object

47. 4. A force can change the direction of a moving object

48. 5. A force can stop a moving object

49. Types of Force

50. CONTACT FORCES 1. Normal reaction Force Every action has an equal and opposite reaction

51. 2. Tension

52. 3. Muscular Force

53. 4. Collision Force

54. 5. Frictional Force

55. Reducing Frictional Force

56. Reducing Frictional Force

57. NON-Contact Forces 1. Magnetic Force

58. NON-Contact Forces 1. Magnetic Force

59. 2. Electrostatic Force

60. 3. Gravitational Force

61. Topics we will cover today Unit of mass and weight Relationship between units of forces Direction and magnitude of Forces Net effect and measurement of force Some definitions and concepts

62. Units of Mass and Weight

63. Relation between kgf,gf and Newton

64. Direction and Magnitude of Force

65. Net Effect of Force

66. If two or more forces act in the same direction, they add up to give a resultant force in the same direction. Net Effect of Force

67. Net Effect of Force

68. Thus, if the two forces acting on a body are equal in magnitude, but opposite in direction, the net force on the body is zero Net Effect of Force

69. Measurement of Force Compression spring balance Extension spring balance

70. Working of Extension Spring Balance

71. Two substances which when rubbed together produce electric charge. How is the charge produced in 2 bodies?

72. Definition of Contact Forces When the force applied on an object is in direct contact i.e., the object with which we apply the force and the object on which the force is applied are in direct contact, then we call it a contact force.

73. Definition of Non-Contact Forces Non-contact force is also called the force acting at a distance. When we apply a force on an object without actual contact, it is the force acting at a distance.

74. Definition of Gravitational Force The force of attraction between any two objects possessing mass is called gravitational force which exists everywhere in the universe. The magnitude of gravitational force between any two bodies depends upon their masses and the distance between them.

75. Definition of Electrostatic Force Force applied by a charged body on an another charged or uncharged body is called electrostatic force.

76. A body is said to be stretched if the force applied on the body increases the length of the body on which the force is applied, i.e , the increase in the length of the force is in the direction of applied force. Definition of Stretch

77. A body is said to be squeezed if the force applied on the body decreases its length or changes its dimension.s Definition of Squeeze

78. A bullock pulling a cart 2. A crane lifting a heavy iron load 3. Weighing something on a spring balance. 4. Applying the brakes on a bicycle. 5. Picking up paper scraps with a plastic ruler. _____________ _____________ _____________ _____________ _____________

79. Topics we will cover today Topics we covered today Unit of mass and weight Relationship between units of forces Direction and magnitude of Forces Net effect and measurement of force Some definitions and concepts