Work and Power Practice Problems

1. Amy uses 20N of force to push a lawn mower 10 meters. How much work does she do?
   

   
   

   
   

2. Joe balances a stationary coin on the tip of his finger 20cm from the top of the table. How much work is Joe doing?
   

   
   

   
   

3. Frank does 2400J of work in climbing a set of stairs. If he does the work in 6 seconds, what is his power output?
   

   
   

   
   

4. How much work is required to pull a sled if you use 60J of work in 5 seconds?
   

   
   

   
   

5. How much work does an elephant do while moving a circus wagon 20meters with a pulling force of 200N?
   

   
   

   
   

6. If it takes 5 seconds for you to do 1000J of work, what is your power output?
   

   
   

   
   

7. A 900N mountain climber scales a 100m cliff. How much work is done by the mountain climber?
   

   
   

   
   

8. A small motor does 4000J of work in 20 seconds. What is the power of the motor in watts?
   

   
   

   
   

9. A woman runs a kilometer using a force of 210N and a power output of 500W. How long in minutes does it take this woman to complete 1 kilometer?
   

   
   

   
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