3.4 Work
Examples
In the following situations, calculate the work being done.
Example #1:
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What is the work done in lifting a 50 kg box to a height of 1.5m? Is this work converted into Ek or Ep? Think about an answer before checking solution. |
Example #2:
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A rock of mass 4.7 kg is lifted from height 2.1 m to 3.0 m. How much work is done on the rock? Is this work converted into Ek or Ep? Think about an answer before checking solution. |
Example #3:
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How much work does a golfer do lifting a 46 g golf ball out of the hole and up to his pocket (0.95 m above the ground)? Is this work converted into Ek or Ep? Think about an answer before checking solution. |
Example #4:
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If a person carries a 200 N box from one shelf to another (same height but 3 m away), what was the work done? Is this work converted into Ek or Ep? Think about an answer before checking solution. |
Example #5:
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At the first stage of a roller coaster ride, the roller coaster is pulled up to the top of the first hill. It climbs 50m with an average force of 20,000N. What is the work being done on the roller coaster? Is the work done being converted into potential or kinetic energy? Think about an answer before checking solution. |
