Question detail
Explain the concept of upthrust and how it relates to an object's ability to float or sink in a fluid Explain your answer using Pressure in liquids (physics only) and upthrust.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Pressure and pressure differences in fluids (physics only)
Question
Explain the concept of upthrust and how it relates to an object's ability to float or sink in a fluid Explain your answer using Pressure in liquids (physics only) and upthrust.
Answer
Upthrust, or buoyant force, is the upward force exerted by a fluid on an object submerged in it. An object will float if the upthrust is equal to or greater than its weight, while it will sink if its weight exceeds the upthrust.
Explanation
A strong answer should address (Physics only) Explain floating and sinking in terms of weight and upthrust directly. Use the context of Pressure in liquids (physics only) within Pressure and pressure differences in fluids (physics only), then state the relevant forces or motion reasoning with units where needed. The answer is correct when it names the key physics quantity, keeps mass and weight distinct, and links the conclusion back to the approved learning objective.
Common mistake
Misunderstanding Upthrust
Students often confuse upthrust with buoyancy, thinking they are the same concept.
Clarify that upthrust is the upward force exerted by a fluid on a submerged object, while buoyancy refers to the overall effect of upthrust and weight on an object's ability to float or sink. In Pressure in liquids (physics only), correct the mistake by naming the relevant force or motion quantity and checking mass and weight.
Related flashcards
Flashcard 1 of 5
Related practice questions
Question 1 of 5
Choose an answer, get feedback, then move sideways through the set.