Upthrust GCSE Physics

Launchpad Learning · ⏱ 2:39 · 6K مشاهدة · 1 year ago

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up thrust is an upward force that acts on objects submerged in liquid so here we have boat that will float on the water's surface and it is partially submerged the boat's weight is pulling it down but because the water isn't solid there's no reaction force instead up thrust keeps the boat afloat now up thrust is experienced by both partially and fully submerged objects so what causes this up thrust and what exactly does it have to do with fluid pressure well the top and bottom of submerged object are at different depths in liquid for example consider some ice submerged in water the water just above the ice is higher up than the water that sits below the ice but what does this tell us about the pressure at these two points well this means the pressure below the object is greater than the pressure above remember that pressure is force spread out over surface and that pressure changes with depth this is because the weight from the water above increases with depth as the particles push against the object therefore the water exerts greater pressure from below and there is more force from the bottom as the water below the ice is deeper so what do we call the resultant of these pressure forces well the up thrust force is result of this pressure difference the resultant upthrust force is the difference between the vertical forces resulting from pressure this Force only acts upwards opposite to weight and this is because the horizontal forces are equal and opposite in an exam you may be asked to explain how pressure differences will cause submerged object to experience up thrust thanks for watching if you want to take your GCSE revision to the next level head over to Launchpad learning.com and check out our Smart Learning platform that's been designed to get you top results in your exams we cover your whole specification and make revision fun with interactive quizzes easy to follow videos and more you'll be kept motivated by your own AI tutor who's here to support you every step of the way to check it out out for yourself click here or click here to keep watching selection of the videos from our full GCSE Physics course see you there