1. The moment of a force is inversely proportional to the turning effect of the force.   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  50 cm, then the fulcrum should be placed _______ cm away from the 70 g mass for the rod to balance.   30   20   15   35   Hint Half-n-half Clue   3. If a man pushes a door with a force of 5 N, then the moment he exerts about the hinge 80 cm away is _______.   4.0 N m   8.0 N m   400.0 N m   800.0 N m   Half-n-half Clue   4. A force of 5 N acts on a small body pushing it vertically upwards. Simultaneously, another force of 10 N acts on it pushing it vertically downwards. The resultant of the two forces is _______.   15 N upwards   5 N downwards   5 N upwards   15 N downwards   Half-n-half Clue   5. The center of gravity of a body is the point about which all the clockwise moments equal all the anticlockwise moments.   True   False   6. A pendulum at rest is in _______ equilibrium.   neutral   stable   unstable   Half-n-half Clue   7. An object with a high center of gravity is more stable than an object with a low center of gravity.   True   False