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Motion in One Dimension. Falling Objects. Free Fall. Free fall – motion of an object falling with a constant acceleration Free fall acceleration due to gravity is represented by g On Earth, g=9.81m/s 2 It is directed toward the center of the Earth

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## Motion in One Dimension

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**Motion in One Dimension**Falling Objects**Free Fall**• Free fall – motion of an object falling with a constant acceleration • Free fall acceleration due to gravity is represented by g • On Earth, g=9.81m/s2 • It is directed toward the center of the Earth • In calculations, g should be negative (-9.81m/s2) • Free fall acceleration is constant • If there is no air resistance, all objects fall at the same rate**Free Fall**• What goes up must come down • Objects thrown up have to deal with negative free fall acceleration as soon as they are thrown • Eventually, this overcomes the positive acceleration sending them up and returns them to the Earth • At the height of the throw, velocity equals zero for just an instant • Acceleration equals -9.81m/s2**Free Fall**• When a falling object returns to the height from where it was thrown the velocity is now equal and opposite the initial velocity • Use the kinematic equations from the previous section • a becomes g • ∆x becomes ∆y as we change axis**g=-9.81m/s2**Free Fall

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