Flashcards
Thrust and Pressure
Flashcards do conjunto (21)
- 1PressureForce per unit area
pressure = thrust/area
or
Force acting perpendicular on a unit area of the objects - 21 PascalWhen 1 newton of force acts on an area of 1 meter,the amount of pressure is said to be 1 Pascal
- 3Explain some everyday observations on the basis of pressure1. School bags have wider straps
2.Sharp knife cuts better than blunt knife
3.Tip of needle is sharp
etc.............................................................. - 4ThrustNet force in a particular direction
or
Force acting on an object perpendicular to the surface - 5Relation bet.force and areaForce on a smaller area exerts a larger pressure and force on a larger area exerts less pressure
- 6FluidsThose substances which flow are called fluids
- 7Pressure in fluidsA solid exerts
pressure on a surface due to its weight.
Similarly, fluids have weight, and they alsoexert pressure on the base and walls of the container in which they are enclosed.Pressure exerted in any confined mass of fluidis transmitted undiminished in all directions. - 8BuoyancyThe tendency of a liquid to exert an upward force on an object placed in it is called bouyancy
- 9Buoyant forceThe upward force acting on an object immersed in a liquid is called as a buoyant force
- 10Causes of buoyant force1 The buoyant force increases with the depth
2 It acts in all the directions - 11Factors affecting Buoyant force(i) Volume of the object immersed in the liquid
(ii) Density of the liquid - 12WeightWeight of an object is the force due to
gravitational attraction of the earth - 13DensityThe density of a substance is
defined as the mass per unit volume - 14Archimedes prinipleWhen a body is immersed fully or partially in a fluid, it experiences an upward force that is equal to the weight of the fluid displaced by it.
- 15help of Archimedes principleThis knowledge helped him to
determine the purity of the gold in the crownmade for the king - 16Applications of Archimedes principle1.Used in designing ships and submarines. 2.Lactometers, which are used to determine the purity of a sample of milk
3.Hydrometers used for determining density of liquids
4. In determining the density of a substance - 17Principal of floatationAn object will float in a liquid if the weight of object is equal to the weight of liquid displaced by it
- 18Importance of DensityThe density of a given
sample of a substance can help us to
determine its purity - 19Relative densityRelative density =Density of a substance/ Density of water
- 20Weight of 1 kg mass of water10 Newtons
- 21Relative DensityRelative density of a substance is the relative density as compared to that of water
Informações
- Descrição
- 10 science FlashCards sobre Thrust and Pressure, criado por Samruddhi Pahune em 11-03-2016.
- Criado por
- Samruddhi Pahune
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