1. The resultant of two forces acting at a point can be determined by using the 'Parallelogram of Forces'.   True   False   2. 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  60 cm, then the fulcrum should be placed _______ cm away from the 70 g mass for the rod to balance.   36   42   24   18   Hint Half-n-half Clue   3. An object with a high center of gravity is more stable than an object with a low center of gravity.   True   False   4. A sphere that is at rest on a table is in _______ equilibrium.   neutral   stable   unstable   Half-n-half Clue   5. If a man pushes a door with a force of 3 N, then the moment he exerts about the hinge 90 cm away is _______.   2.7 N m   5.4 N m   270.0 N m   540.0 N m   Half-n-half Clue   6. The center of gravity of a thin rectangular metal plate is at the   intersection of its diagonals.   midpoint of the longer side.   midpoint of the shorter side.   one of the vertices.   Half-n-half Clue   7. The point where all the _______ of an object appears to be concentrated is called its center of gravity.   centrifugal force   density   weight   centripetal force   Half-n-half Clue