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Mechanics (Kinematics)

Mechanics (Kinematics). Constant Velocity Zero acceleration. Review of Variables. These are all the variables you may see in Mechanics problems X i - initial position (m) X f - final position (m) V i - initial velocity (m/s) V f - final velocity (m/s) a – acceleration (m/s 2 )

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Mechanics (Kinematics)

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  1. Mechanics (Kinematics) Constant Velocity Zero acceleration

  2. Review of Variables • These are all the variables you may see in Mechanics problems • Xi - initial position (m) • Xf - final position (m) • Vi - initial velocity (m/s) • Vf - final velocity (m/s) • a – acceleration (m/s2) • t – time (s)

  3. Constant Velocity • Key Point: Acceleration is always 0, but velocity will not be 0. • or • The object is still moving, but velocity is unchanging.

  4. Equation • Displacement (m) = velocity (m/s) * time (sec) • Δx = v t

  5. Example • During a race on level ground, Andra runs with an average velocity of 6.02 m/s to the east. What is Andra’s displacement after 137 s?

  6. Example • During a race on level ground, Andra runs with an average velocity of 6.02 m/s to the east. What is Andra’s displacement after 137 s? • Givens: • v = 6.02 m/s • t = 137 sec

  7. Example • During a race on level ground, Andra runs with an average velocity of 6.02 m/s to the east. What is Andra’s displacement after 137 s? • Givens: • v = 6.02 m/s • t = 137 sec • Formula Δx = v t → Δx = (6.02m/s)(137s)

  8. Example • During a race on level ground, Andra runs with an average velocity of 6.02 m/s to the east. What is Andra’s displacement after 137 s? • Givens: • v = 6.02 m/s • t = 137 sec • Formula Δx = v t → Δx = (6.02m/s)(137s) • Solution:Δx = 825 m to the East

  9. Practice • For classwork, complete Practice A on page 44 in your textbook.

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