41The turning effect of a force about a point is called what?
42What is the SI unit of torque?
43The center of gravity of a body is the point where its entire what appears to act?
44A body is said to be in equilibrium when the net force acting on it is what?
45Scissors are a common example of which class of lever?
46A wheelbarrow is a common example of which class of lever?
47The human forearm lifting a weight is an example of which class of lever?
48The efficiency of a machine is the ratio of its output work to its what?
49No real machine can be 100 percent efficient mainly due to losses from what?
50Work done on an object is calculated as force multiplied by what?
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