Upthrust and Archimedes' Principleπ₯
ο»Ώο»ΏAn object immersed in a liquid experienccs an upward force which is called the upthrust or buoyancy.
ο»Ώο»ΏThe upthrust is due to the difference in pressure between the upper and the lower faces of the object, the pressure being greater at the lower face.
ο»Ώο»ΏArchimedes' principle states that a body immersed in a fluid experiences an upward force (upthrust) which is equal to the weight of the fluid displaced.
Any immersed body thus experiences two forces
ο»Ώο»Ώο»Ώο»Ώits true weight(I) acting vertically downward, an
ο»Ώο»Ώο»Ώο»Ώthe upthrust (Fu) acting vertically upward.
ο»Ώο»ΏAn object immersed in a liquid experienccs an upward force which is called the upthrust or buoyancy.
ο»Ώο»ΏThe upthrust is due to the difference in pressure between the upper and the lower faces of the object, the pressure being greater at the lower face.
ο»Ώο»ΏArchimedes' principle states that a body immersed in a fluid experiences an upward force (upthrust) which is equal to the weight of the fluid displaced.
Any immersed body thus experiences two forces
ο»Ώο»Ώο»Ώο»Ώits true weight(I) acting vertically downward, an
ο»Ώο»Ώο»Ώο»Ώthe upthrust (Fu) acting vertically upward.
π10β€1
β’ It follows that:
(i) an object which is denser than the liquid (d. > dL) has a positive apparent weight, and therefore sinks in the liquid;
(ii)an object which is less dense than the liquid d.< dL)has a negative apparent weight, and rises in the liquid;
(ili)as the object rises to the liquid's surface, the volume of liquid displaced decreases, resulting in a decrease in the upthrust while the true weight remains constant;
(iv) a point is eventually reached at which the upthrust becomes just equal to the true weight, i.e. the apparent weight is zero, and the object floats partially submerged in this position.
This leads to the principle of flotation: a floating body displaces a weight of fluid which is equal to its own weight.
(i) an object which is denser than the liquid (d. > dL) has a positive apparent weight, and therefore sinks in the liquid;
(ii)an object which is less dense than the liquid d.< dL)has a negative apparent weight, and rises in the liquid;
(ili)as the object rises to the liquid's surface, the volume of liquid displaced decreases, resulting in a decrease in the upthrust while the true weight remains constant;
(iv) a point is eventually reached at which the upthrust becomes just equal to the true weight, i.e. the apparent weight is zero, and the object floats partially submerged in this position.
This leads to the principle of flotation: a floating body displaces a weight of fluid which is equal to its own weight.
π7
A body which weighs 50 N in air displaces 3.7 kg of water when partially immersed in water. The upthrust on the body is
Attempt everyone β¨
Attempt everyone β¨
β€1
A solid object weighs 750 N in air and 525 N when completely immersed in a liquid of relative density
0.75. The volume of the solid is
Letβs attempt this alsoβ¨
0.75. The volume of the solid is
Letβs attempt this alsoβ¨
Pls listen keenly to the vn..
Have a blessed light..
Have a blessed light..
π14β€1
Distinction tutorial
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COMMON ERRORS
This topic is geared towards identifying those errors that most students are prone to in spoken and written English. In the same vein, efforts would be made to simultaneously provide the right versions of these errors. Examples of such errors abound.
πΉDivine upliftment/ Divine uplift
Divine upliftment (Wrong)
Divine uplift(Right)
Note: There is no word like 'upliftment' in the English language. It is one of the new coinagew that most public speakers use with impunity.
The word 'uplift' can also be used as a noun and as a verb. It means to raise, increase or promote. 'Uplift' is also a feeling of hope and happiness.
E.g
I. This is my year of divine upliftment (Wrong)
II. This is my year of divine uplift(Right)
III. The news that the Governor survived the plane crash gave us the mich needed uplift (Right)
πΉ godsent/godsend
godsent - Wrong
godsend - Right
Note: There is no such word like 'godsent' in the English language. Again, it does not mean "the person that God has sent" as it is weongky believed by most users of the word.
'Godsend' means something good that happens unexpectedly and helps somebody or something when they need help e.g.
I. This man is godsent to this family (Wrong)
II. This man is a godsend to this family (Right)
III. The new doctrine of giving to the needy ones has come as a godsend to the widows in our church (Right)
πΉDo you hear English?/Do you understand English
Do you hear English? (Wrong)
Do you understand the English language (Right)
Note: It is wrong to ask a person whether he or she hears the English language or any other language e.g. Yoruba, Hausa, Igbo, Efik etc. Every human being that does not have hearing problems hears all languages.
'Hearing' is one thing while 'understanding' is another. Therefore, if you are in doubt of your listener's ability to fathom what you are saying, the right question to ask is: 'Do you understand the English language?' not 'Do you hear English?. E.g
I. The Director advised all those who do not hear English to register for special English class (Wrong)
II. The Director advised all those who do not understand the English Language to register for special English class (Right)
DT's 2026 UTME Tutorial has fully commenced. Join us today and gain access to our past & ongoing lectures.
π In our classes, you are always free to ask your tutors questions.
πYou also receive detailed explanations of all class exercises.
β 10+ hours of daily intensive prep
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*Subjects:* English, Maths, Physics, Chem, Bio
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π 1-Month: β¦4,000
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π Secure your spot: https://wa.me/2347025521431?text=Hi+Dr+Joe,+my+name+is---%2C+I%27m+interested+in+DT%27s+JAMB+Master+Class.
This topic is geared towards identifying those errors that most students are prone to in spoken and written English. In the same vein, efforts would be made to simultaneously provide the right versions of these errors. Examples of such errors abound.
πΉDivine upliftment/ Divine uplift
Divine upliftment (Wrong)
Divine uplift(Right)
Note: There is no word like 'upliftment' in the English language. It is one of the new coinagew that most public speakers use with impunity.
The word 'uplift' can also be used as a noun and as a verb. It means to raise, increase or promote. 'Uplift' is also a feeling of hope and happiness.
E.g
I. This is my year of divine upliftment (Wrong)
II. This is my year of divine uplift(Right)
III. The news that the Governor survived the plane crash gave us the mich needed uplift (Right)
πΉ godsent/godsend
godsent - Wrong
godsend - Right
Note: There is no such word like 'godsent' in the English language. Again, it does not mean "the person that God has sent" as it is weongky believed by most users of the word.
'Godsend' means something good that happens unexpectedly and helps somebody or something when they need help e.g.
I. This man is godsent to this family (Wrong)
II. This man is a godsend to this family (Right)
III. The new doctrine of giving to the needy ones has come as a godsend to the widows in our church (Right)
πΉDo you hear English?/Do you understand English
Do you hear English? (Wrong)
Do you understand the English language (Right)
Note: It is wrong to ask a person whether he or she hears the English language or any other language e.g. Yoruba, Hausa, Igbo, Efik etc. Every human being that does not have hearing problems hears all languages.
'Hearing' is one thing while 'understanding' is another. Therefore, if you are in doubt of your listener's ability to fathom what you are saying, the right question to ask is: 'Do you understand the English language?' not 'Do you hear English?. E.g
I. The Director advised all those who do not hear English to register for special English class (Wrong)
II. The Director advised all those who do not understand the English Language to register for special English class (Right)
DT's 2026 UTME Tutorial has fully commenced. Join us today and gain access to our past & ongoing lectures.
π In our classes, you are always free to ask your tutors questions.
πYou also receive detailed explanations of all class exercises.
β 10+ hours of daily intensive prep
β Seminars with 350+ scorers
β Weekly mocks & prizes
β β¦100,000+ for top scorers
β 24/7 mentorship
β Access to past lectures
*Subjects:* English, Maths, Physics, Chem, Bio
*Venue:* WhatsApp/Telegram
*Current Price (act now!):*
π 1-Month: β¦4,000
π 2-Months: β¦7,000
π 3-Months: β¦9,999
π Secure your spot: https://wa.me/2347025521431?text=Hi+Dr+Joe,+my+name+is---%2C+I%27m+interested+in+DT%27s+JAMB+Master+Class.
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π₯As you can see above, itβs not too late to join us. You will have full access to all our past and ongoing lectures, and you can revisit them anytime at your convenience.
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Our 2026 Intensive Tutorial has fully commenced. Donβt worry about what you may have missed β once you join, you get instant access to all previous lectures.
Start today!
π https://wa.me/2347025521431?text=Hi+Dr+Joe,+my+name+is---%2C+I%27m+interested+in+DT%27s+JAMB+Master+Class.
The train has moved, but the door is still open! π
Our 2026 Intensive Tutorial has fully commenced. Donβt worry about what you may have missed β once you join, you get instant access to all previous lectures.
Start today!
π https://wa.me/2347025521431?text=Hi+Dr+Joe,+my+name+is---%2C+I%27m+interested+in+DT%27s+JAMB+Master+Class.
π₯JAMB candidates! Are you ready to smash the 2026 UTME, if yes, don't miss this π
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DT presents FREE
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Join via:
https://chat.whatsapp.com/DcZLYMyJtdk75HRAmBWmr0
*Subjects & Topics To Be Taught:*
ENGLISH: Comprehension (How to correctly answer JAMB comprehension questions)
CHEMISTRY: Metals and Their Compounds
PHYSICS: Nuclear and Atomic Physics
*Featuring:*
- Intensive free tutorials from experienced tutors
- Access to JAMB-recommended texts and materials
- Smart tricks and shortcuts for answering JAMB questions correctly
- And lots more!
π Date: 7th β 9th February, 2026
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