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Speed and Velocity

Speed and Velocity. A rate is: Quantity/time It tells us: How fast something is moving How much something changes in a given time Motion is relative Everything moves Things at rest on earth move relative to the Sun and Stars A vector is a quantity with both Magnitude (size) Direction

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Speed and Velocity

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  1. Speed and Velocity

  2. A rate is: • Quantity/time • It tells us: • How fast something is moving • How much something changes in a given time • Motion is relative • Everything moves • Things at rest on earth move relative to the Sun and Stars • A vector is a quantity with both • Magnitude (size) • Direction • Scalar is • A quantity with Magnitude only

  3. Position - Separation between an object and the reference point. • It is a vector (has size and direction) • A reference point must be chosen • Distance • Total distance traveled – no direction • Displacement -where you are compared to where you started. • It is a vector. • Equation: d = df - di

  4. Speed measures • How fast something is moving • It is the rate at which distance is covered • It has no direction • It is measured in terms of Units of distance/Units of time • Average speed • Total distance/time or v = d/t • It is an average • It is the whole distance • It is not displacement • It does not indicate different speeds and variations

  5. Velocity tell us: • How fast • It is speed in a given direction • It tells us how fast and in what direction • Constant velocity - Displacement/time • Equation: v = df – di /t

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