CHAPTER 3 PHYSICS LECTURE

• A scalar quantityis completely specified by a single value with an appropriate unit and has no direction.
• A vector quantity is completely described by a number and appropriate units plus a direction.
• Distance traveled and is a scalar.
• Two vectors are equalif they have the same magnitude and the same direction.
• Associative Property of Addition - When adding three or more vectors, their sum is independent of the way in which the individual vectors are grouped.
• The negative of a vector is defined as the vector that, when added to the original vector, gives a resultant of zero.
• The negative of the vector will have the same magnitude, but point in the opposite direction.
• The result of the multiplication or division of a vector by a scalar is a vector.
• The magnitude of the vector is multiplied or divided by the scalar.
• If the scalar is positive, the direction of the result is the same as of the original vector.
• If the scalar is negative, the direction of the result is opposite that of the original vector.
• Unit vectors are used to specify a direction and have no other physical significance.
• A unit vector is a dimensionless vector with a magnitude of exactly 1.