1. 1. The unit vector of a force is a vector of A) magnitude 0 in the opposite direction of the force. B) magnitude 0 in the same direction as the force. C) magnitude 1 in the opposite direction of the force. D) magnitude 1 in the same direction as the force. 2. If F 1 = 3 i – 4 j and F 2 = 2 i + j, the resultant of F 1 and F 2 is A) 5 i – 3 j B) i – 5 j C) 5 i + 3 j D) – i + 5 j READING QUIZ

2. 1. In Cartesian coordinate system, the axes x, y and z A) are parallel to each other. B) are perpendicular to each other and follow the left hand rule. C) are perpendicular to each other and follow right hand rule. D) can be chosen arbitrarily. 2. If  is the unit vector of A, then  has the A) same magnitude as A. B) same sign as A. C) same dimension as A. D) same direction as A. CONCEPT QUIZ

3. 1. If cos , cos  and cos  represent directional cosines with repect to x, y, z-axes, which of the following statements is true? A) cos  + cos  + cos  = 1 B) cos 2  + cos 2  + cos 2  = 1 C) cos . cos  + cos . cos  + cos . cos  = 1 D) (cos  + cos  + cos  ) 2 = 1 2. Any vector can be represented as the product of its magnitude and its A) unit vector.B) position vector. C) components.D) directional cosines. ATTENTION QUIZ