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Edit Comment Close Premium member Presentation Transcript Slide 1: 01 Thrust & Pressure project date 26/10/2010 Presented by Deepak Saxena Class : 9th ‘B’ Slide 2: DEFAULT STYLES 04 Gravitation The force of attraction between any two object can be said as gravitation . There is one universal law of gravitation by Newton . Slide 3: DEFAULT STYLES 04 Universal Law Of Gravitation By Newton Universal law of gravitation states that every object in the universe attracts every other object with a force directly proportional to the product of their masses and inversely proportional to the square of their distance. Slide 4: Profement Slide 5: DEFAULT STYLES 04 Importance of universal law of gravitation The law explains that : The force bind us to the earth. The motion of the moon around the earth . The motion of earth the sun. The tides due to sun and the moon. Slide 6: DEFAULT STYLES 04 Freefall Whenever the objects fall toward the earth under its force alone then it is said that freefall is taking place. For example : Take a stone Throw it down from the building Here the action taking place can be said to be as freefall Slide 7: DEFAULT STYLES 04 Mass The mass of an object is the measure of it inertia . Characteristics of mass: The greater is the mass greater is the inertia. The mass of an object is constant Mass do not change from place to place Slide 8: DEFAULT STYLES 04 Weight The force of attraction on the earth on an object is known as the weight of the object . Characteristics of weight : The si unit of weight is Newton ( N ). It is the force that acts vertically downward. it has both magnitude and the direction . Slide 9: . DEFAULT STYLES Thrust The force acting on an object perpendicular to the surface is called as thrust. Slide 10: DEFAULT STYLES Example: We wish to fix a poster on a bulletin board . To do this task we need to press the drawing pins through our thumb . It is seen that we apply force on the surface area oof the pin’s head. This force is directly perpendicular to the surface area of the board . Slide 11: DEFAULT STYLES Conclusion : Here by this activity we can observe that there is thrust force acting upon it i.e; the object ( pin ) is perpendicular to the surface ( board ) . Slide 12: DEFAULT STYLES 04 Pressure Force that acts on unit per area is said to Pressure . Hence we can write pressure as : P= force/are = F/A = Thrust/Area Slide 13: DEFAULT STYLES 04 Fluids All liquids and gases are said to be Fluids . Slide 14: DEFAULT STYLES 04 Pressure in fluids As we all know that solids exerts pressure . In same way fluids have weight and they also apply pressure on the base as well as the walls of the container in which they are to be kept . Hence we can say that the fluids exerts pressure . Slide 15: DEFAULT STYLES 04 Buoyancy firstly let me ask a question to you . Have you ever swim in water and had felt lighter then that you are . Here is the answer to my question “buoyancy” I c am going to explain to you that what is buoyancy and its factors . Slide 16: Activity: Take an empty bottle, a bucket filled with water . Now take the bottle and push it down in the water. Do you feel that something is pushing that bottle towards you . Now try to sink the bottle as deeper as you can. The jumps and came out . So friends from this activity we had observed that there is certain force that pushes the objects upward in the water , this force is said to be the up thrust or the buoyancy Slide 17: DEFAULT STYLES 04 Why do objects sink or float in water To show this we need to perform one more activity here we are: Take a glass filled with water . Take an iron nail , foam place them on the water. So we observed that the nail sinks . This because the force by the nail was greater than that of the up thrust . But the foam was floating on the water this was happened because the force of foam was equilent to the up thrust. Slide 18: DEFAULT STYLES 04 u Text box Slide 19: Bullet Point Bullet Point Sub Bullet Sub Bullet 05 BULLET STYLES You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.