Difference between revisions of "Upthrust"
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− | A [[force]] that acts upwards in a [[fluid]] due to the [[fluid]] being [[displaced]]. | + | ==Key Stage 3== |
+ | ===Meaning=== | ||
+ | [[Upthrust]] is a [[force]] that acts upwards in a [[fluid]] due to the [[fluid]] being [[Displace|displaced]]. | ||
+ | |||
+ | ===About Upthrust=== | ||
+ | : [[Upthrust]] is a [[force]] so it is [[Measure|measured]] in [[Newton]]s. | ||
+ | : The [[force]] of [[upthrust]] is equal to the [[weight]] of [[fluid]] that has been [[Displace|displaced]] by an [[object]]. | ||
+ | : An [[object]] in the [[water]] experiences more [[upthrust]] than an [[object]] in [[air]] because [[water]] is more [[Density|dense]] than [[air]]. | ||
+ | : [[Upthrust]] is weak in the [[air]] because the [[air]] is not very [[Density|dense]]. For most [[object]]s in [[air]] [[upthrust]] can be ignored because it is so small. | ||
+ | : [[Upthrust]] is caused by the [[pressure]] in a [[fluid]]. [[Pressure]] increases with [[depth]] so the bottom of an [[object]] will experience more [[pressure]] than the top. This difference in [[pressure]] results in a difference between the [[force]] on the bottom and the top, known as [[upthrust]]. | ||
+ | ===Examples=== | ||
+ | {| class="wikitable" | ||
+ | |- | ||
+ | |[[File:UpthrustBoat.png|center|250px]] | ||
+ | |[[File:UpthrustSubmarine.png|center|300px]] | ||
+ | |- | ||
+ | | style="height:20px; width:300px; text-align:center;" |A boat floats on the water because the [[weight]] is balanced by the [[upthrust]]. | ||
+ | | style="height:20px; width:300px; text-align:center;" |A submarine can change the amount of [[upthrust]] in order to rise or sink in the [[water]]. | ||
+ | |} | ||
+ | |||
+ | ==Key Stage 4== | ||
+ | ===Meaning=== | ||
+ | [[Upthrust]] is a [[force]] that acts upwards in a [[fluid]] due to the weight of the [[fluid]] being [[Displace|displaced]]. | ||
+ | |||
+ | ===About Upthrust=== | ||
+ | : [[Upthrust]] is a [[force]] so it is [[Measure|measured]] in [[Newton]]s. | ||
+ | : The [[force]] of [[upthrust]] is equal to the [[weight]] of [[fluid]] that has been [[Displace|displaced]] by an [[object]]. | ||
+ | : An [[object]] in the [[water]] experiences more [[upthrust]] than an [[object]] in [[air]] because [[water]] is more [[Density|dense]] than [[air]]. | ||
+ | : [[Upthrust]] is weak in the [[air]] because the [[air]] is not very [[Density|dense]]. For most [[object]]s in [[air]] [[upthrust]] can be ignored because it is so small. | ||
+ | : [[Upthrust]] is caused by the [[pressure]] in a [[fluid]]. [[Pressure]] increases with [[depth]] so the bottom of an [[object]] will experience more [[pressure]] than the top. This difference in [[pressure]] results in a difference between the [[force]] on the bottom and the top, known as [[upthrust]]. | ||
+ | : [[Upthrust]] = [([[Pressure]] at base) - ([[Pressure]] at the top)] x (Area of top and bottom surface) | ||
+ | |||
+ | ===Examples=== | ||
+ | {| class="wikitable" | ||
+ | |- | ||
+ | |[[File:UpthrustBoat.png|center|250px]] | ||
+ | |[[File:UpthrustSubmarine.png|center|300px]] | ||
+ | |- | ||
+ | | style="height:20px; width:300px; text-align:center;" |A boat floats on the water because the [[weight]] is balanced by the [[upthrust]]. | ||
+ | | style="height:20px; width:300px; text-align:center;" |A submarine can change the amount of [[upthrust]] in order to rise or sink in the [[water]]. | ||
+ | |} | ||
+ | |||
+ | ===References=== | ||
+ | ====AQA==== | ||
+ | |||
+ | :[https://www.amazon.co.uk/gp/product/1471851370/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851370&linkCode=as2&tag=nrjc-21&linkId=01c69b0ae058f809cf636033e6ba793e ''Upthrust, page 137, GCSE Physics, Hodder, AQA ''] | ||
+ | :[https://www.amazon.co.uk/gp/product/0008158770/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158770&linkCode=as2&tag=nrjc-21&linkId=ec31595e720e1529e49876c3866fff6e ''Upthrust, page 173, GCSE Physics; Student Book, Collins, AQA ''] | ||
+ | :[https://www.amazon.co.uk/gp/product/178294558X/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=178294558X&linkCode=as2&tag=nrjc-21&linkId=f0dfb66dafcb0c6e9449e7b1a4ae1ac475 ''Upthrust, page 59, GCSE Physics; The Revision Guide, CGP, AQA ''] | ||
+ | :[https://www.amazon.co.uk/gp/product/019835939X/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=019835939X&linkCode=as2&tag=nrjc-21&linkId=57e96876985fc39b1a3d8a3e3dc238b6 ''Upthrust, pages 168-169, GCSE Physics; Third Edition, Oxford University Press, AQA ''] | ||
+ | :[https://www.amazon.co.uk/gp/product/1782945970/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945970&linkCode=as2&tag=nrjc-21&linkId=a120d24dcc7cc7a58192069a3aafc1d2 ''Upthrust, pages 172, 173, GCSE Physics; The Complete 9-1 Course for AQA, CGP, AQA ''] | ||
+ | |||
+ | ====Edexcel==== | ||
+ | |||
+ | :[https://www.amazon.co.uk/gp/product/1782945733/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945733&linkCode=as2&tag=nrjc-21&linkId=2a2dbec9db6bf5766c0458d908fa0a52 ''Upthrust, page 102, GCSE Physics; The Revision Guide, CGP, Edexcel ''] | ||
+ | :[https://www.amazon.co.uk/gp/product/1292120223/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120223&linkCode=as2&tag=nrjc-21&linkId=068ecf40278c32406a7f1c6e66751417 ''Upthrust, pages 204-205, GCSE Physics, Pearson Edexcel ''] | ||
+ | :[https://www.amazon.co.uk/gp/product/1782948163/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782948163&linkCode=as2&tag=nrjc-21&linkId=0fdbfd5dd397d6e24a9dfb250f08587f ''Upthrust, pages 321, 322, GCSE Physics, CGP, Edexcel ''] | ||
+ | |||
+ | ====OCR==== | ||
+ | :[https://www.amazon.co.uk/gp/product/1782945687/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945687&linkCode=as2&tag=nrjc-21&linkId=9a598e52189317a20311d7a632747bc9 ''Upthrust, page 19, Gateway GCSE Physics; The Revision Guide, CGP, OCR ''] | ||
+ | :[https://www.amazon.co.uk/gp/product/0198359837/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359837&linkCode=as2&tag=nrjc-21&linkId=3c4229e8b023b2b60768e7ea2307cc6f ''Upthrust, pages 42, 63, Gateway GCSE Physics, Oxford, OCR ''] |
Latest revision as of 11:02, 21 December 2019
Contents
Key Stage 3
Meaning
Upthrust is a force that acts upwards in a fluid due to the fluid being displaced.
About Upthrust
- Upthrust is a force so it is measured in Newtons.
- The force of upthrust is equal to the weight of fluid that has been displaced by an object.
- An object in the water experiences more upthrust than an object in air because water is more dense than air.
- Upthrust is weak in the air because the air is not very dense. For most objects in air upthrust can be ignored because it is so small.
- Upthrust is caused by the pressure in a fluid. Pressure increases with depth so the bottom of an object will experience more pressure than the top. This difference in pressure results in a difference between the force on the bottom and the top, known as upthrust.
Examples
A boat floats on the water because the weight is balanced by the upthrust. | A submarine can change the amount of upthrust in order to rise or sink in the water. |
Key Stage 4
Meaning
Upthrust is a force that acts upwards in a fluid due to the weight of the fluid being displaced.
About Upthrust
- Upthrust is a force so it is measured in Newtons.
- The force of upthrust is equal to the weight of fluid that has been displaced by an object.
- An object in the water experiences more upthrust than an object in air because water is more dense than air.
- Upthrust is weak in the air because the air is not very dense. For most objects in air upthrust can be ignored because it is so small.
- Upthrust is caused by the pressure in a fluid. Pressure increases with depth so the bottom of an object will experience more pressure than the top. This difference in pressure results in a difference between the force on the bottom and the top, known as upthrust.
- Upthrust = [(Pressure at base) - (Pressure at the top)] x (Area of top and bottom surface)
Examples
A boat floats on the water because the weight is balanced by the upthrust. | A submarine can change the amount of upthrust in order to rise or sink in the water. |
References
AQA
- Upthrust, page 137, GCSE Physics, Hodder, AQA
- Upthrust, page 173, GCSE Physics; Student Book, Collins, AQA
- Upthrust, page 59, GCSE Physics; The Revision Guide, CGP, AQA
- Upthrust, pages 168-169, GCSE Physics; Third Edition, Oxford University Press, AQA
- Upthrust, pages 172, 173, GCSE Physics; The Complete 9-1 Course for AQA, CGP, AQA
Edexcel
- Upthrust, page 102, GCSE Physics; The Revision Guide, CGP, Edexcel
- Upthrust, pages 204-205, GCSE Physics, Pearson Edexcel
- Upthrust, pages 321, 322, GCSE Physics, CGP, Edexcel