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Kinematics 2. Average and Instantaneous Velocity 2-2, 2-3. Speed. Speed is a scalar. No direction. Your car does not have a velocitometer . It does not tell you direction. Your car’s speedometer indicates the speed only.

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kinematics 2

Kinematics 2

Average and Instantaneous Velocity

2-2, 2-3

speed
Speed
  • Speed is a scalar.
    • No direction.
    • Your car does not have a velocitometer. It does not tell you direction.
    • Your car’s speedometer indicates the speed only.
  • In physics, we must be very precise when using the terms speed and velocity.
velocity
Velocity
  • Vector
    • Speed plus direction
    • Speed is the magnitude of the velocity vector
    • Can be positive or negative to indicate the direction
instantaneous velocity
Instantaneous Velocity
  • The “average” velocity over an infinitesimally short period of time.
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