Physics Section 3.1 Represent quantities using vectors A vector is a physical quantity that has both magnitude and direction. A scalar is a physical quantity that has magnitude but no direction. Scalar Quantities Speed 8 m/s Distance 3 m Time 45 s Vector quantities Velocity 8 m/s east Displacement 3 m west Acceleration 7.5 m/s2 up

Vector quantities are represented by an arrow Vector quantities are represented by an arrow. The length of the arrow represents the magnitude and the orientation indicates the direction. Draw the vector. v = 10 m/s left v = 15 m/s up a = 25 m/s2 down a = 5 m/s2 right

A single vector that has the same result as two or more vectors is called the resultant of the vectors.

Opposite vectors have the same magnitude, and opposite direction. Problems: v = 10 N right Find 2v and -3v

Find the resultant velocity of an airplane that flies with a velocity of 300 km/h south, and the wind blows with a velocity of 80 km/h west, using graphic techniques. http://phet.colorado.edu/en/simulation/vector-addition

Assignment Page 85 Problems 1-5