Acceleration (Leaving Cert Physics): Flashcards

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Acceleration Due to Gravity
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Symbol for acceleration due to gravity

gg

Value of gg near Earth's surface

Approximately 9.89.8 m s−2^{-2}

Meaning of g=9.8g = 9.8 m s−2^{-2}

Velocity increases by 9.89.8 m/s every second

Gravitational force acting on a mass

Weight

Mass vs weight: which varies with location

Weight changes, mass remains constant

How objects fall in a vacuum (no air resistance)

All objects fall at the same rate

How gg changes with increasing altitude

gg decreases

Free fall equation (object dropped from rest)

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

Equation to calculate gg from experimental data

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

Sign of gg for object thrown vertically upward

Negative

Graph shape of distance ss vs time squared t2t^2

Straight line through the origin

Finding gg from ss vs t2t^2 graph

g=2×g = 2 \times slope of graph

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