| Method |
Precise Learning Objective |
Linked |
Question / Activity
(Designed for maximum working out) |
Stepping Stones |
Pitstop Check
(Thinking Map) |
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(Physics only) A fluid can be either a liquid or a gas. |
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(Physics only) What states can be fluids? class practical - experience pressure in fluids |
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(Physics only) The pressure in fluids causes a force normal (at right angles) to any surface. |
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(Physics only) Pressure in fluid causes a force in what direction to the surface? Show the piddle tube and students explain why this happens |
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(Physics only) The pressure at the surface of a fluid can be calculated using the equation: pressure = force normal to a surface
area of that surface
p = F / A
pressure, p, in pascals, Pa force, F, in newtons, N
area, A, in metres squared, m2 |
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(Physics only) What equation can be used to calculate the pressure of a fluid at the surface? |
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(Physics only) The pressure due to a column of liquid can be calculated using the
equation:
pressure = height of the column ? density of the liquid
? gravitational field strength
[ p = h ? g ]
pressure, p, in pascals, Pa
height of the column, h, in metres, m
density, ?, in kilograms per metre cubed, kg/m3
gravitational field strength, g, in newtons per kilogram, N/kg (In any
calculation the value of the gravitational field strength (g) will be given |
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(Physics only) How can the pressure due to a column of liquid be calculated? |
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(Physics only) Students should be able to explain why, in a liquid, pressure at a point
increases with the height of the column of liquid above that point and with
the density of the liquid. |
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(Physics only) What two factors increase the pressure at a point in a liquid? demo - Cartesian diver |
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(Physics only) Students should be able to calculate the differences in pressure at different
depths in a liquid. (MS) |
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(Physics only) How does pressure change as you get deeper in the sea? |
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(Physics only) A partially (or totally) submerged object experiences a greater pressure on
the bottom surface than on the top surface. This creates a resultant force
upwards. This force is called the upthrust. |
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(Physics only) How do differences in pressure create the force of upthrust? |
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(Physics only) Students should be able to describe the factors which influence floating and
sinking. |
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(Physics only) What factors influence whether an object floats or sinks? |
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(Physics only) The atmosphere is a thin layer (relative to the size of the Earth) of air round the Earth. |
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(Physics only) What is the atmosphere? |
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(Physics only) The atmosphere gets less dense with increasing altitude |
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(Physics only) What happens to the density of the atmosphere as the altitude increases? |
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(Physics only) Air molecules colliding with a surface create atmospheric pressure. |
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(Physics only) What creates atmospheric pressure? |
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(Physics only) The number of air molecules (and so the weight of air) above a surface decreases as the height of the surface above ground level increases. |
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(Physics only) What happens to the weight of air above a surface as the height of that surface is increased above ground level? |
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(Physics only) So as height increases there is always less air above a surface than there is at a lower height. So atmospheric pressure decreases with an increase in height |
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(Physics only) Why does atmospheric pressure decrease with an increase in height? |
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(Physics only) Students should be able to describe a simple model of the Earth?s atmosphere and of atmospheric pressure |
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(Physics only) How would the particles in the air be arranged close to the Earth's surface then getting further up with altitude. |
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(Physics only) Students should be able to explain why atmospheric pressure varies with height above a surface |
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(Physics only) Why does atmospheric pressure vary with height above the surface? |
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