Gravitational Field Strength = Gravitational Force / Mass
While the above formula for pressure is simple, you should be acquainted with the following formula for pressure in liquids. It relates the change in pressure to the density of the fluid, the gravitational field strength, and the height difference.
Some of the equations at the end do not need to be learnt but will be given on an insert in the paper. These equations are at the end of the list. There is an equation highlighted in red that is not in the specification but helps to understand some important concepts. The equation list required for OCR, CIE, AQA trilogy and combined science are almost if not identical. The Eduqas specification requires more use of Newton’s equations of motion sometimes called the SUVAT equations.
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In simple words, the pressure only depends on the height of the water column, provided that the liquid being used is the same (same density). As such, a larger cross-sectional area makes no difference to the amount of pressure exerted by a liquid. This concept is often tested in the MCQ section of O Level Physics Paper 1.
This form is used often to calculate the weight of an object given its mass m and the gravitational field strength g of the planet. Keep in mind that mass is independent of gravity, whereas the weight of an object can vary depending on how strong the gravitational field strength g is!
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