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Pressure In Gases Liquids

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Pressure In Gases Liquids

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    1. Pressure In Gases & Liquids D. Crowley, 2008

    2. Pressure In Gases & Liquids To be able to explain how gases and liquids exert pressure Sunday, March 25, 2012

    3. States Of Matter Remember, there are 3 states of matter solids, liquids, and gases (only gases can be compressed (squashed)) In liquids and gases the particles are moving around as they bump into the surface the force of the particles hitting it causes pressure

    4. Pressure In Gases Pressure is caused by the force of particles hitting the side of the container Why does tyre pressure increase when you pump more air into it? Particles in gases are normally spaced far apart When a tyre is pumped up, the air gets compressed (squashed) inside this means there are more gas particles trapped inside As there are more particles inside the tyre, particles hit the sides of the wall more often, increasing its pressure

    5. Pressure Outside?!

    6. Pressure In Gases: Boyles Law Squashing a gas into a smaller space causes the pressure to increase in proportion to how much you squash it Squash the gas into the space, and it will result in 2x the pressure Squash the gas into the space, and it will result in 4x the pressure Boyles Law - there must be a fixed amount of gas (i.e. none escapes) and there must remain a constant temperature

    7. Pressure In Liquids Pressure in a liquid acts in all directions Pressure in a liquid increases with depth can you explain why?

    8. Pressure In Liquids The greater the depth, the greater the pressure (the weight of the water above compresses the water below)

    9. Pressure In Liquids Liquids (like solids) cannot be compressed (squashed) as there are no gaps between the particles As liquids cannot be compressed, they can be used to send forces from one area to another these are known as hydraulic systems

    10. Hydraulics How can you stop a car at 70mph using just your foot? How about stopping a motorbike at this speed with two fingers?! Pressure is transmitted through a liquid Hydraulic systems can be used to increase the size of a force (master piston applies the force which is transmitted to the slave piston)

    11. Nothing Free The slave piston has a larger area than the master piston, so the force exerted by the slave piston on the brakes is greater than the force exerted at the master (i.e. you get much more force from slave when you gently press the master) This is how you can stop a very heavy object, traveling at high speed, by simply using your foot / your fingers The larger force at the slave piston comes at a price it only moves the slave piston half the distance (so the energy out is the same as the energy in)

    12. Pressure Complete the pressure worksheet

    13. Pressure Pressure = Force Area Force = Pressure x Area Pressure = 100 5 Pressure = 20N Force = 20 x 25 Force = 500N So a force of 100N to the master gives a force 5x bigger of 500N to the slave

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