Chapter 7 Pressure
Slides in this set (6)
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- Caption: Oh My God What Is This?!
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- Pressure is DEFINED as the FORCE ACTING per UNIT AREA.
- SI unit of pressure: Newton per sq metre/pascal
- Caption: p= pressure in (Pa), F= force in (N), A= area in metre sq.
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- The amount of pressure inside a body of liquid increases with depth.
- At greater depths,the weight of liquid is greater.Hence,the pressure is greater.
- Liquid pressure formula:
- p= height(m) x Density of liquid x gravitational field strength
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What affects the pressure in liquids?
- Pressure in liquid depends only on the vertical height of the liquid column and the,not the volume & the cross-sectional area/shape of the column.
- Hence,at equilibrium,the liquid level in all the columns is at the same height.
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Transmission of pressure in liquids
- Caption: Hydraulic Machine
- We learned hydraulic action in Geography and we're gonna learn about hydraulic machines in Physics..
- Hydraulic machines enable heavy objects like cars to be lifted with a small amount of effort.
- They use liquids to transmit pressure.Pressure is applied to an enclosed liquid,the pressure is transmitted equally to all other parts of the liquid.(Pascal's Principle)
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