2.  You are moving into an apartment and take the elevator to the 6th floor. Suppose your weight is 685 N and that of your belongings is 915 N. (a) Determine the work done by the elevator in lifting you and your belongings up to the 6th floor (15.2 m) at a constant velocity. (b) How much work does the elevator do on you alone (without belongings) on the downward trip, which is also made at a constant velocity?

Since the elevator is moving at constant speed

 

Going up, displacement   is pointing up

 

Since  point in the same direction, the angle between them is 0°.  We also know that FElev is the Weight going up.

 

 

 

Going down, displacement   is pointing down and the weight going down is just the person.

 

 

 

 

 

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This page last updated on January 11, 2020