AP Physics 1 - Basic Vocab + Equations

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13 Terms

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Position

The location of something, (x, y, etc…)

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initial position

The position of where an object starts; xi

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final position

the position where the same object ends up; xf

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distance (d)

total length of the path taken by an object; never negative

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displacement

change in (total) position with the direction of change;
Δx = xf- xi (direction)

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speed

  • How fast an object travels

  • Never negative

    • SI units = m/s

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Instantaneous speed

How fast an object is going at a specific moment in time

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Average speed

  • how fast, on average, an object moves during a moment in time

  • Vaverage = dtotal / ttotal

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Constant Speed

When the speed of an object is always the same/unchanging

v = d / t

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Velocity

  • Speed + Direction; How fast somethign is traveling and what direction it is traveling

  • Uses DISPLACEMENT

    • Not distance

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Acceleration

How quickly an object’s velocity is changing; Acceleration = a
SI units = (m/s) / s = m/s2

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Constant Acceleration (EQUATIONS)

  • vf = vi + at

  • d = ½ (vi + vt) t

  • d = vit + ½ at2

  • vf2 = vi2 + 2ad

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freefall

When the only force on a (falling) object is gravity; air resistance is ignored
A= 9.8 m/s2