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Energy

Practice Test
      
  1.Which of the following statements about an apple falling from a tree is true?  
  a.   Its kinetic energy decreases and its potential energy increases.  
  b.   Its mechanical energy increases.  
  c.   Its potential energy decreases and its kinetic energy increases.  
  d.   Its kinetic and potential energies remain constant.  
  Hint    
      
  2.How much gravitational potential energy does a 75-kg diver have stepping off the edge of a 5-m platform?  
  a.   375 J  
  b.   147 J  
  c.   3,675 J  
  d.   15 J  
  Hint    
      
  3.Which of the following vehicles has the most kinetic energy?  
  a.   a 300-kg motorcycle traveling 100 km/h  
  b.   a 2000-kg truck traveling 50 km/h  
  c.   a 1,100-kg car traveling 60 km/h  
  d.   a 900-kg car traveling 80 km/h  
  Hint    
      
  4.Carbohydrates and proteins each supply about __________ Calories of energy per gram.  
  a.   40  
  b.   4  
  c.   400  
  d.   14  
  Hint    
      
  5.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.   1,250 J  
  b.   250 J  
  c.   125,000 J  
  d.   2,500 J  
  Hint    
      
  6.By what process does the Sun produce enough energy to warm Earth?  
  a.   catabolism  
  b.   nuclear fusion  
  c.   transformation of thermal energy into kinetic energy  
  d.   glycolysis  
  Hint    
      
  7.As energy transformations occur within a system, the total energy of the system __________.  
  a.   is transferred out of the system  
  b.   decreases  
  c.   remains constant  
  d.   increases  
  Hint    
      
  8.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.   shape and speed of the object  
  c.   weight of the object and height above the ground  
  d.   weight and speed of the object  
  Hint    
      
  9.__________ is the energy stored in an object due to its position.  
  a.   Kinetic energy  
  b.   Thermal energy  
  c.   Entropy  
  d.   Potential energy  
  Hint    
      
  10.During energy transformations, energy is never __________.  
  a.   released as heat  
  b.   created or destroyed  
  c.   completely transformed  
  d.   used to increase an object's potential energy  
  Hint    
      
  11.One food Calorie is equivalent to approximately __________.  
  a.   4,000 J  
  b.   400 J  
  c.   4 J  
  d.   40 J  
  Hint    
      
  12.Which of the following objects has kinetic energy?  
  a.   a bicycle parked at the top of a hill  
  b.   a ball rolling across the floor  
  c.   leaves lying on the ground beneath a tree  
  d.   a sunny windowsill  
  Hint    
      
  13.Without changing the mass of a moving object, doubling its velocity will __________ its kinetic energy.  
  a.   not affect  
  b.   quadruple  
  c.   double  
  d.   triple  
  Hint    
      
  14.Which of the following is NOT a form of energy?  
  a.   thermal  
  b.   friction  
  c.   electrical  
  d.   chemical  
  Hint    
      
  15.A baseball is hit into the air with a bat. When does the baseball have the greatest gravitational potential energy?  
  a.   when it leaves the bat  
  b.   when it hits the ground  
  c.   when the mechanical and kinetic energies of the baseball are equal  
  d.   when it reaches its highest point  
  Hint    
      
  16.__________ is the ability to cause change.  
  a.   Work  
  b.   Momentum  
  c.   Energy  
  d.   Power  
  Hint    
      
  17.Which of the following objects has potential energy?  
  a.   a ball rolling across the floor  
  b.   a bicycle coasting down a hill  
  c.   a bowling ball knocking over a pin  
  d.   a glass sitting on a table  
  Hint    
      
  18.__________ is energy stored by things that stretch or compress.  
  a.   Gravitational potential  
  b.   Chemical kinetic energy  
  c.   Elastic potential energy  
  d.   Elastic kinetic energy  
  Hint    
      
  19.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    
      
  20.Energy stored in chemical bonds is __________.  
  a.   thermal potential energy  
  b.   energy of activation  
  c.   chemical potential energy  
  d.   chemical kinetic energy  
  Hint    

 
   
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