pressure ks3 science aims. aim; understand the relationship between; force area pressure write...
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Pressure
Ks3 Science
Aims
Aim;
Understand the relationship between;
Force Area Pressure
Write detailed explanations about pressure using scientific language.
Odd one out
SKILL AIM
FACT AIM
Which is the odd one out and why?
Simple definition
Pressure;
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!
Pressure;
Answers
Use the writing frames in the next slides to help explain what is happening in the two pictures underneath.
Pick from the options and construct a paragraph on your sheet.
Describe
Camels footFootballers boot
Create your sentences;
The studs sink
because
they are small,
they are sharp,
the person is heavy,
they have a small surface area,
the pressure is low,
the pressure is high,
the persons weight is spread out,
the persons weight is concentrated
Answers
Create your sentences;The camel
has large feet
because
it is heavy,
it lives on sand,
its body weight must be concentrated,
sand is soft,
its body weight must be spread out,
this stops it sinking,
this creates lower the pressure,
this increases the pressure.
Answers
Pressure;
Odd one out
Watch the two video clips about pressure and do the same task.
This time use your own explanations using your previous examples for reference.
Describe
Tank v BallerinaNettle Stings
Which is the odd one out and why?
Aims
Aim;
Understand the relationship between;
Force Area Pressure
Write detailed explanations about pressure using scientific language.
Odd one out
SKILL AIM
FACT AIM
Sharing/ Division?
If I have an apple and share it between 2 people or 4 people I can write mathematically as;
Simple definition
4
125.041
2
15.021
So each person either
gets a half an apple or a quarter of an apple. The more people I share it with the less apple the get each.
Pressure; 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;
A
FP Force ( N, Newton)
Area (m2 or cm2)Pressure (N/m2 or N/cm2)
Pressure Examples;
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 (N/m2 or N/cm2)
Pressure Examples;
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)
Pressure Comparison;
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)
Force ( N, Newton)
P = Pressure (N/m2 or N/cm2)
2
2
/10
1
10
cmNP
cm
NP
A
FP
Aim;
Understand the relationship between;
Force Area Pressure
Write detailed explanations about pressure using scientific language.
Odd one out
SKILL AIM
FACT AIM