Physics 221 Quiz 2b 1. The branch of physics that deals with motion and not the forces that cause motion is called a). Dynamics b). Kinematics c). Mechanics d). Thermodynamics. 2. Mass is a vector because it has magnitude only. a). False b). True 3. At its maximum height the velocity of an object is c). O d). vertical A). negative b). positive 4. The x-component of a vector B is given as a). B*cos(0) b). B*tan(e) c). B*sin(0) where O is the angle between B and the x-axis. d). B*B 5. What is the SI unit for acceleration? A). m b). m/sec? c). (km/sec)3 d). m/sec 6. If the velocity and acceleration vectors of an object point in opposite directions then the object a). Slows Down b). Speeds Up c). Speed Remains Constant 7. Using the tail-head method to draw the sum of the four vectors A + B + C +D. 8. The numerical value of g is d). -4.9 A). -9.8 b). 9.8 c). 4.9 9. The magnitude of the cross product AxB is given by the formula between the vectors A and B: a). A*B*tan(0) b). A *B* cos(0) d). None of the others where 0 is the angle c). A*B*sin(e) 10. In a velocity vs. time Cartesian plot the slope of the curve is the A). Acceleration b). Velocity c). Speed of the object. d). secant