Question

What number do we use to represent gravitational force in the physics equations used in this class?

Answer

Answer 1

Near Earth's surface we use the gravitational acceleration g ≈ 9.8 m/s² (often rounded to 9.81 m/s²). In equations weight (gravitational force) is F_g = m·g (or F = mg).
(Some classes use g = 10 m/s² for easier calculation—check your instructor if unsure.)