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Energy

Practice Test
      
  1.How much gravitational potential energy does a 75-kg diver have stepping off the edge of a 5-m platform?  
  a.   15 J  
  b.   3,675 J  
  c.   147 J  
  d.   375 J  
  Hint    
      
  2.Which of the following is NOT a form of energy?  
  a.   thermal  
  b.   chemical  
  c.   electrical  
  d.   friction  
  Hint    
      
  3.As energy transformations occur within a system, the total energy of the system __________.  
  a.   remains constant  
  b.   increases  
  c.   decreases  
  d.   is transferred out of the system  
  Hint    
      
  4.Which of the following objects has potential energy?  
  a.   a bicycle coasting down a hill  
  b.   a bowling ball knocking over a pin  
  c.   a ball rolling across the floor  
  d.   a glass sitting on a table  
  Hint    
      
  5.A baseball is hit into the air with a bat. When does the baseball have the greatest gravitational potential energy?  
  a.   when it hits the ground  
  b.   when the mechanical and kinetic energies of the baseball are equal  
  c.   when it leaves the bat  
  d.   when it reaches its highest point  
  Hint    
      
  6.The law of conservation of energy states that __________.  
  a.   energy cannot be created or destroyed  
  b.   energy can be created and destroyed but cannot change form  
  c.   energy is not created or destroyed and its form is constant  
  d.   when energy is transformed, the total energy of a system is less than it was before the change  
  Hint    
      
  7.The total amount of potential and kinetic energy in a system is called __________.  
  a.   thermal energy  
  b.   energy maximum  
  c.   mechanical energy  
  d.   complete energy  
  Hint    
      
  8.__________ is energy stored by things that stretch or compress.  
  a.   Chemical kinetic energy  
  b.   Gravitational potential  
  c.   Elastic potential energy  
  d.   Elastic kinetic energy  
  Hint    
      
  9.What two factors determine how much potential energy an object has?  
  a.   speed and surface area  
  b.   speed and position  
  c.   mass and position  
  d.   speed and mass  
  Hint    
      
  10.__________ is the energy stored in an object due to its position.  
  a.   Kinetic energy  
  b.   Entropy  
  c.   Thermal energy  
  d.   Potential energy  
  Hint    
      
  11.What is a joule?  
  a.   a unit measuring the amount of energy we get from various foods  
  b.   the unit of measurement describing the change in velocity in a unit time  
  c.   the unit of force required to move 1 kg of mass 1 m/s/s  
  d.   a unit of energy that depends on both an object's mass and velocity  
  Hint    
      
  12.Which of the following statements about an apple falling from a tree is true?  
  a.   Its kinetic and potential energies remain constant.  
  b.   Its mechanical energy increases.  
  c.   Its potential energy decreases and its kinetic energy increases.  
  d.   Its kinetic energy decreases and its potential energy increases.  
  Hint    
      
  13.Which of the following vehicles has the most kinetic energy?  
  a.   a 900-kg car traveling 80 km/h  
  b.   a 1,100-kg car traveling 60 km/h  
  c.   a 2000-kg truck traveling 50 km/h  
  d.   a 300-kg motorcycle traveling 100 km/h  
  Hint    
      
  14.Energy stored in chemical bonds is __________.  
  a.   chemical potential energy  
  b.   energy of activation  
  c.   chemical kinetic energy  
  d.   thermal potential energy  
  Hint    
      
  15.Without changing the mass of a moving object, doubling its velocity will __________ its kinetic energy.  
  a.   triple  
  b.   not affect  
  c.   quadruple  
  d.   double  
  Hint    
      
  16.During energy transformations, energy is never __________.  
  a.   used to increase an object's potential energy  
  b.   completely transformed  
  c.   created or destroyed  
  d.   released as heat  
  Hint    
      
  17.What two factors determine how much kinetic energy an object has?  
  a.   speed and position  
  b.   speed and mass  
  c.   speed and surface area  
  d.   position and mass  
  Hint    
      
  18.One food Calorie is equivalent to approximately __________.  
  a.   400 J  
  b.   4,000 J  
  c.   4 J  
  d.   40 J  
  Hint    
      
  19.What two factors determine how much gravitational potential energy is in an object?  
  a.   shape of the object and its position relative to the ground  
  b.   weight and speed of the object  
  c.   weight of the object and height above the ground  
  d.   shape and speed of the object  
  Hint    
      
  20.How much kinetic energy does a moving object have if its mass is 100 kg and it is moving at a speed of 5 meters per second?  
  a.   125,000 J  
  b.   2,500 J  
  c.   250 J  
  d.   1,250 J  
  Hint    

 
   
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