Upthrust & atmospheric pressure (Edexcel GCSE Physics): Flashcards

Resultant upward force on object in liquid

Weight of water displaced by the object

Pressure increases with depth

Upthrust $\geq$ weight of object

Upthrust $<$ weight of object

Air molecules colliding with surfaces

Approximately 100 kPa

Pressure decreases as altitude increases

Less air above, so fewer air molecules present

Clear, calm weather

Cloudy, rainy, or stormy weather

Lower temperature