Physics notes - Motion

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Physics notes Motion Copyright 2009 Free download and print from 1 Physics notes Motion Free download and print from Copyright 2009 Scalar and vector quantities A scalar quantity requires a numerical value and a unit to specify it, distance km and mass 10 kg are scalar quantities. Example 1 Name two more scalar quantities. Surface area, 12 m2; air pressure, kPa A vector quantity requires a numerical value together with a unit and a direction to specify it completely. The numerical value with the unit is called the magnitude of the vector quantity. Examples of vector quantities are: force, N left; velocity, 70 km h 1 N35 W. Example 2 Name two other examples of vector quantities. Gravitational field, N kg 1 downward; momentum change, kg ms 1 SE Vector quantities in one dimension In one dimension, a positive or negative sign is used to indicate the direction of a vector quantity.

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