1. The SI unit of moment is   N/m   N/m2   N m   Hint Half-n-half Clue   2. The center of gravity of a thin rectangular metal plate is at the   midpoint of the shorter side.   one of the vertices.   midpoint of the longer side.   intersection of its diagonals.   Half-n-half Clue   3. Consider a thin rectangular plastic sheet. If a small piece of the plastic breaks off at one of the vertices, then the center of gravity of the remaining plastic (with respect to the original center of gravity)   will move away from the broken vertex.   will not move.   cannot be determined.   will move towards the broken vertex.   Half-n-half Clue   4. Three forces in equilibrium acting at a point can be represented in magnitude and direction by the sides of a triangle taken in order.   True   False   5. A mass of 70 g is attached at one end of a rod, and a mass of 30 g is attached at the other end. If the length of the rod is  40 cm, then the fulcrum should be placed _______ cm away from the 70 g mass for the rod to balance.   12   16   28   24   Half-n-half Clue   6. The point where all the _______ of an object appears to be concentrated is called its center of gravity.   weight   centripetal force   density   centrifugal force   Half-n-half Clue   7. If a man pushes a door with a force of 5 N, then the moment he exerts about the hinge 70 cm away is _______.   3.5 N m   7.0 N m   350.0 N m   700.0 N m   Half-n-half Clue