A) A man with a mass of 80 kilogram (kg) is carrying a box with a mass of 22,5 kilogram (kg). The gravitational field strength on earth is 9.8 Newton/kilogram (N/kg). Calculate the weight of this man and the box together.
B) On the moon this man's weight would be 165 Newton. calculate the gravitational field strength of the moon
W=m⋅g
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Calculating pressure
A woman weighing 76 kg is wearing high heels to the zoo. She goes to see an elephant with a mass of 5221 kg. One of her heels has a total area of 8.4 cm2. One of the elephants feet has an area of 301 cm2.
a) Without making calculations, make an estimation of wether the elephant or the women applies a greater pressure to the ground. Write down your reasoning.
b) Calculate the pressure the women applies to the ground in N/m2.
c) Calculate the pressure the elephant applies to the ground N/m2.
P=AF
W=m⋅g
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Learning goals
At the end of this lesson you can:
Explain how hydraulics work in your own words
Name the formula for hydraulics
Rearrange the formula for hydraulics
Do calculations on hydraulic systems
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What do we know about this system?
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What do we know about this system?
1
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What do we know about this system?
1
2
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What do we know about this system?
Fluids are incompressible
1
2
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What do we know about this system?
Fluids are incompressible
P1=P2
1
2
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What do we know about this system?
Fluids are incompressible
P1=P2
1
2
A1F1=A2F2
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P1=P2
A1F1=A2F2
Rearranging the formula!
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0.01 m2
0.4 m2
20 N
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Worksheet
P1=P2
A1F1=A2F2
If you're done, start reading paragraph 8.5 and working on the workbook exercises of 8.5
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Learning goals
At the end of this lesson you can:
Explain how hydraulics work in your own words
Name the formula for hydraulics
Rearrange the formula for hydraulics
Do calculations on hydraulic systems
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Pressure in liquids
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This lesson
Liquid pressure and upthrust
Hydraulics
Worksheet pressure
Time to work on exercises
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Learning goals
Describe the basics of liquid pressure in your own words.
Explain how liquid pressure creates the force upthrust.
Be able to explain how hydraulic machines work in your own words.
Be able to do calculations with hydraulic systems
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Liquid pressure
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Upthrust
What is upthrust?
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Upthrust
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Hydraulics
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0.01 m2
0.4 m2
20 N
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Working on exercises
Slide 32 - Slide
Learning goals
Describe the basics of liquid pressure in your own words.
Explain how liquid pressure creates the force upthrust.
Be able to explain how hydraulic machines work in your own words.
