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GCSE
Physics paper 2
Liquid Pressure & Upthrust
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Created by
Mabli Collyer
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Cards (20)
What are we going to calculate in this video?
Pressure
in a
liquid
and
floating
objects
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What primarily causes pressure on an object submerged in water?
Surrounding
water molecules
colliding with it
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What happens to pressure as an object moves deeper in water?
Pressure
increases
due to more
water
above
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What determines the pressure in a liquid?
Density
of the liquid and
gravitational field strength
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What is the formula for pressure in a liquid?
Pressure
= height ×
density
×
gravitational strength
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If the height of the liquid column is 20 meters, density is 1000 kg/m³, and gravitational strength is 9.8 m/s², what is the pressure?
196,000
pascals
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What is the pressure at a depth of 90 meters with the same density and gravitational strength?
882,000
pascals
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How do you calculate the change in pressure when moving from 20 meters to 90 meters?
Subtract pressure at
20m
from
90m
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What is the change in pressure when moving from 20 meters to 90 meters?
686,000
pascals
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What is up thrust in relation to submerged objects?
Upward
force exerted by
surrounding
water
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Why does a submerged box experience a larger upward force at the bottom?
Because the bottom is
deeper
than the top
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What determines whether an object floats or sinks?
Comparison of up thrust and object's
weight
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What happens if the weight of an object is larger than the up thrust?
The object
sinks
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What happens if the up thrust is larger than the object's weight?
The object
floats
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How can we determine if an object will float without calculating up thrust and weight?
By comparing
densities
of the object and
liquid
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What happens to a dense object like a rock in water?
It
sinks
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What happens to a less dense object like an apple in water?
It
floats
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What factors determine the pressure in a liquid?
Depth
of the liquid
Density
of the liquid
Gravitational field strength
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What are the conditions for an object to float or sink?
If
up thrust
>
weight
, it floats
If weight > up thrust, it sinks
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What is the relationship between density and buoyancy?
Denser
objects
sink
Less dense objects
float
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