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Energy

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

 
   
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