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# pressure - PowerPoint PPT Presentation

Pressure. Ks3 Science. Aims. Aim;. Understand the relationship between; Force Area Pressure Write detailed explanations about pressure using scientific language. . FACT AIM. SKILL AIM. Odd one out. Which is the odd one out and why?. Simple definition. Pressure;.

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Presentation Transcript

### Pressure

Ks3 Science

Aims

• Understand the relationship between;

• Force

• Area

• Pressure

• Write detailed explanations about pressure using scientific language.

• FACT AIM

SKILL AIM

Odd one out

Simple definition

• 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.

TRY IT!

Low Pressure

High Pressure

Literacy

• 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.

Footballers boot

Camels foot

Describe

• 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 Ballerina

Nettle Stings

Odd one out

• Understand the relationship between;

• Force

• Area

• Pressure

• Write detailed explanations about pressure using scientific language.

• FACT AIM

SKILL AIM

Odd one out

• If I have an apple and share it between 2 people or 4 people I can write mathematically as;

• 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.

Simple definition

• 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 (N/m2 or N/cm2)

• 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)

• 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)

• 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)

• Understand the relationship between;

• Force

• Area

• Pressure

• Write detailed explanations about pressure using scientific language.

• FACT AIM

SKILL AIM

Odd one out