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Energy

Practice Test
      
  1.Which of the following objects has kinetic energy?  
  a.   a ball rolling across the floor  
  b.   leaves lying on the ground beneath a tree  
  c.   a sunny windowsill  
  d.   a bicycle parked at the top of a hill  
  Hint    
      
  2.What is a joule?  
  a.   a unit of energy that depends on both an object's mass and velocity  
  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 measuring the amount of energy we get from various foods  
  Hint    
      
  3.By what process does the Sun produce enough energy to warm Earth?  
  a.   nuclear fusion  
  b.   transformation of thermal energy into kinetic energy  
  c.   catabolism  
  d.   glycolysis  
  Hint    
      
  4.Energy stored in chemical bonds is __________.  
  a.   chemical kinetic energy  
  b.   chemical potential energy  
  c.   thermal potential energy  
  d.   energy of activation  
  Hint    
      
  5.During energy transformations, energy is never __________.  
  a.   completely transformed  
  b.   created or destroyed  
  c.   released as heat  
  d.   used to increase an object's potential energy  
  Hint    
      
  6.__________ is the ability to cause change.  
  a.   Momentum  
  b.   Energy  
  c.   Work  
  d.   Power  
  Hint    
      
  7.How much gravitational potential energy does a 75-kg diver have stepping off the edge of a 5-m platform?  
  a.   3,675 J  
  b.   15 J  
  c.   375 J  
  d.   147 J  
  Hint    
      
  8.Which of the following is NOT a form of energy?  
  a.   thermal  
  b.   chemical  
  c.   electrical  
  d.   friction  
  Hint    
      
  9.__________ is energy stored by things that stretch or compress.  
  a.   Elastic kinetic energy  
  b.   Elastic potential energy  
  c.   Gravitational potential  
  d.   Chemical kinetic energy  
  Hint    
      
  10.The total amount of potential and kinetic energy in a system is called __________.  
  a.   energy maximum  
  b.   mechanical energy  
  c.   thermal energy  
  d.   complete energy  
  Hint    
      
  11.What two factors determine how much kinetic energy an object has?  
  a.   speed and surface area  
  b.   position and mass  
  c.   speed and position  
  d.   speed and mass  
  Hint    
      
  12.Which of the following objects has potential energy?  
  a.   a glass sitting on a table  
  b.   a bicycle coasting down a hill  
  c.   a bowling ball knocking over a pin  
  d.   a ball rolling across the floor  
  Hint    
      
  13.Without changing the mass of a moving object, doubling its velocity will __________ its kinetic energy.  
  a.   not affect  
  b.   quadruple  
  c.   triple  
  d.   double  
  Hint    
      
  14.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    
      
  15.What two factors determine how much gravitational potential energy is in an object?  
  a.   shape and speed of the object  
  b.   shape of the object and its position relative to the ground  
  c.   weight of the object and height above the ground  
  d.   weight and speed of the object  
  Hint    
      
  16.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    
      
  17.One food Calorie is equivalent to approximately __________.  
  a.   4 J  
  b.   4,000 J  
  c.   400 J  
  d.   40 J  
  Hint    
      
  18.A baseball is hit into the air with a bat. When does the baseball have the greatest gravitational potential energy?  
  a.   when the mechanical and kinetic energies of the baseball are equal  
  b.   when it reaches its highest point  
  c.   when it hits the ground  
  d.   when it leaves the bat  
  Hint    
      
  19.__________ is the energy stored in an object due to its position.  
  a.   Entropy  
  b.   Potential energy  
  c.   Thermal energy  
  d.   Kinetic energy  
  Hint    
      
  20.As energy transformations occur within a system, the total energy of the system __________.  
  a.   is transferred out of the system  
  b.   increases  
  c.   remains constant  
  d.   decreases  
  Hint    

 
   
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