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

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6.2 – Determining Acceleration Due to Gravity
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Purpose of free-fall experiment

Determine acceleration due to gravity (g)

Kinematic equation for free fall

s=12gt2s = \frac{1}{2}gt^2

Formula to calculate g from s and t

g=2st2g = \frac{2s}{t^2}

Accepted value of g

Approximately 9.8 m s⁻¹

Distance s measured from where to where

Bottom of ball to top of trapdoor

Minimum repeat measurements per distance

At least three times

Which time value to use for calculation

Smallest time value

Why use smallest time value

Timing errors overestimate time

Number of different distances to test

Five or six

Variable plotted on y-axis

Distance fallen, s

Variable plotted on x-axis

Time squared, t2t^2

Relationship between graph slope and g

g=2×slopeg = 2 \times \text{slope}

Ideal object for minimising air resistance

Small, smooth, dense metal sphere

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