why is electricity produced at the bottom of dams? when you catch a deep-sea fish, why does its eyes...
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Why is electricity produced at the bottom of dams?
When you catch a deep-sea fish, why does its eyes pop-out?Why do your ears pop on an airplane or up in the mountains?
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Pick 3 pictures and decide what they have to do with pressure
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Understand the relationship among
Force Area Pressure
Write detailed explanations about pressure using scientific language.
SKILL
FACT
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Literacy
When we talk about pressure in Science we use it as a measure of the ratio of how much push or force there is acting on a given surface area.
Simply put if a girl pushes by the same amount on a desk….
The smaller the contact area the larger the pressure is.
High Pressure Low Pressure
TRY IT!
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A
FP
What we have done is work out a qualitative idea for pressure;
“the larger the area is the lower the pressure.”
However we can describe this mathematically;
Force ( N, Newton)
Area (m2 or cm2)Pressure (Pa, Pascal)
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2
2
/10
1
10
cmNP
cm
NP
A
FP
A person pushes on a desk with a force of 10N. The contact area of their finger is 1 cm2.
A = Area (m2 or cm2)
Force ( N, Newton)
P = Pressure (Pascal)
10 Pa
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2
2
/08.0
125
10
cmNP
cm
NP
A
FP
A person pushes on a desk with a force of 10N. The contact area of their hand is 125 cm2.
A = Area (m2 or cm2)
Force ( N, Newton)
P = Pressure (N/m2 or N/cm2)
10 Pa0.08 Pa
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2
2
/08.0
125
10
cmNP
cm
NP
A
FP
We can now see the relationship numerically or quantitatively. As the area increases the pressure decreases;
A = Area (m2 or cm2)
F=Force ( N, Newton)
P = Pressure (Pa, Pascal)
2
2
/10
1
10
cmNP
cm
NP
A
FP
0.08 Pa10 Pa
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