Lesson 5

Pressure in liquids

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Pressure in liquids

Slide 1 - Diapositive

This lesson

Recap + exercise
Fluid pressure
Working on exercises

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Learning goals

Name the formulas for pressure and weight and be able to apply them.

Explain what is meant by liquid pressure.

Explain why there is greater pressure at the bottom of the sea than at the surface.

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Recap

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P3 — Pressure & density

Pressure is the result of force being applied to a surface.
Force is measured in newtons (N)
area is measured in square meters (m²)

The formula for pressure is:

The unit of pressure is pascal (Pa). One pascal is 1 N/m²

P r e s s u r e = \frac{​ f o r c e ​ ​}{​ a r e a ​}

Slide 5 - Diapositive

P3 — Pressure & density

Weight:

With how much force an object is pulled down

W e i g h t = m a s s \cdot g r a v i t a t i o n a l f i e l d s t r e n g t h

W = m \cdot g

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Pressure

ρ = \frac{​ F ​ ​}{​ A ​}

p r e s s u r e = \frac{​ F o r c e ​ ​}{​ A r e a ​}

Pressure (ρ): Pascal (Pa – N/m²), N/cm²

Force (V): N

Area (m): m², cm²

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Pressure

w = m \cdot g

W e i g h t = m a s s \cdot g r a v i t a t i o n a l f i e l d s t r e n g t h

Weight (W): Newton (N)

Mass (m): kilogram (kg)

Gravitational field strength (g): N/kg

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Exercise

Two scenario's:

1) A man is standing on 7,60 cm thick ice. He has a mass of 88 kg and one of his feet has an area of 0.0047 m²

2) A man is laying flat on his back on 7,60 cm thick ice. He has a mass of 88 kg. His body touching the ice has an area of 0.0915 m²

Ice of this thickness breaks at about 18.000 Pascal (N/m2).

The gravitational field strength on Earth is 9.8 N/kg

a) Calculate the pressure for each scenario.

b) Explain wether the ice will break or not.

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Liquid pressure

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Upthrust

What is upthrust?

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Upthrust

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Liquid pressure

And upthrust

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To-do for the coming week

Read:

Do:

8.3 yellow block + workbook exercises
8.3 yellow block + workbook exercises

Due for the seconds lesson of next week

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Learning goals

Name the formulas for pressure and weight and be able to apply them.

Explain what is meant by liquid pressure.

Explain why there is greater pressure at the bottom of the sea than at the surface.

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Lesson 5

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