MAT136H1 Lecture Notes - Metric System
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MAT136H1 Full Course Notes
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Question #1 (easy): work done based on constant force. The key is to differentiate the components that represent the force needed to calculate the work done. For work done, first the force needs to be calculated because it is used as input for work calculation. In the international metric system, force is in newton ( ), distance is in meters ( ); therefore work is in (called joule ). In the us metric system, force is in pounds ( , fundamental unit of force), distance is in feet ( ); therefore work is in foot-pound ( ). Keeping track of the units is very important. Notice the units are given in the us metric system. Work requires force since , and force is given by . But the us unit of pound represents force. So further calculation for force based on the equation is not necessary. Plug into work equation: ( ) ( ) ( ).
