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Power And Work Answers

   1. What is the equation used to calculate power?

  Work done / time 

 

   2. What are the units for power?

  Watts

  

   3. What are the units for work done?

  Joules

 

   4. What is the equation used to calculate work done?

  Force x distance moved 

   5. What is the equation used to calculate kinetic energy?

  0.5 x mass x velocity ^2

 

   6. What would the work done be when a one-kilogram brick is carried up a ladder that is 15 metres tall?

  150 J

 

   7.  How can we calculate gravitational potential energy on Earth?

  mass × height × gravitational field strength (g) 

  Gravitational field strength is 10 on earth

 

   8.  If a motor does 500 J of work to lift a 100 N weight, how high was the weight lifted?

  5 M

 

   9.  Define power  

  work done/time or rate of work done 

 

   10. How much work is done by a 12N force pushing a box 4 m across the floor?

  48 J