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Energy

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

 
   
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