9.1 – Determining Acceleration Due to Gravity (Leaving Cert Physics): Flashcards

Determine acceleration due to gravity ($g$)

$g = \frac{P}{\rho h}$

How pressure changes with depth in a liquid

Absolute pressure sensor

Atmospheric pressure (at $h = 0$)

$g = \frac{(P_{abs} - P_0)}{h \rho}$

Approximately $9.8$ m/s²

$P_{abs}$ against $h$

$\rho g$

$g = \frac{\text{slope}}{\rho}$

$P_{abs} = P_0 + \rho g h$

Linear

Horizontal at the bottom (open entrance)

Bottom of the meniscus

Keep eye level with measurement point