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Energy

Practice Test
      
  1.As energy transformations occur within a system, the total energy of the system __________.  
  a.   decreases  
  b.   remains constant  
  c.   is transferred out of the system  
  d.   increases  
  Hint    
      
  2.What two factors determine how much kinetic energy an object has?  
  a.   speed and position  
  b.   position and mass  
  c.   speed and mass  
  d.   speed and surface area  
  Hint    
      
  3.__________ is the ability to cause change.  
  a.   Power  
  b.   Energy  
  c.   Work  
  d.   Momentum  
  Hint    
      
  4.By what process does the Sun produce enough energy to warm Earth?  
  a.   glycolysis  
  b.   transformation of thermal energy into kinetic energy  
  c.   catabolism  
  d.   nuclear fusion  
  Hint    
      
  5.The total amount of potential and kinetic energy in a system is called __________.  
  a.   complete energy  
  b.   thermal energy  
  c.   mechanical energy  
  d.   energy maximum  
  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 300-kg motorcycle traveling 100 km/h  
  d.   a 1,100-kg car traveling 60 km/h  
  Hint    
      
  7.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 it reaches its highest point  
  d.   when the mechanical and kinetic energies of the baseball are equal  
  Hint    
      
  8.Which of the following objects has potential energy?  
  a.   a ball rolling across the floor  
  b.   a glass sitting on a table  
  c.   a bicycle coasting down a hill  
  d.   a bowling ball knocking over a pin  
  Hint    
      
  9.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.   125,000 J  
  c.   2,500 J  
  d.   1,250 J  
  Hint    
      
  10.What two factors determine how much gravitational potential energy is in an object?  
  a.   weight of the object and height above the ground  
  b.   weight and speed of the object  
  c.   shape and speed of the object  
  d.   shape of the object and its position relative to the ground  
  Hint    
      
  11.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 kinetic and potential energies remain constant.  
  c.   Its potential energy decreases and its kinetic energy increases.  
  d.   Its mechanical energy increases.  
  Hint    
      
  12.One food Calorie is equivalent to approximately __________.  
  a.   4 J  
  b.   4,000 J  
  c.   400 J  
  d.   40 J  
  Hint    
      
  13.What two factors determine how much potential energy an object has?  
  a.   mass and position  
  b.   speed and surface area  
  c.   speed and position  
  d.   speed and mass  
  Hint    
      
  14.__________ is the energy stored in an object due to its position.  
  a.   Thermal energy  
  b.   Potential energy  
  c.   Entropy  
  d.   Kinetic energy  
  Hint    
      
  15.__________ is energy stored by things that stretch or compress.  
  a.   Elastic potential energy  
  b.   Gravitational potential  
  c.   Elastic kinetic energy  
  d.   Chemical kinetic energy  
  Hint    
      
  16.Which of the following objects has kinetic energy?  
  a.   a sunny windowsill  
  b.   a bicycle parked at the top of a hill  
  c.   leaves lying on the ground beneath a tree  
  d.   a ball rolling across the floor  
  Hint    
      
  17.Without changing the mass of a moving object, doubling its velocity will __________ its kinetic energy.  
  a.   not affect  
  b.   double  
  c.   triple  
  d.   quadruple  
  Hint    
      
  18.Carbohydrates and proteins each supply about __________ Calories of energy per gram.  
  a.   4  
  b.   400  
  c.   14  
  d.   40  
  Hint    
      
  19.Which of the following is NOT a form of energy?  
  a.   chemical  
  b.   electrical  
  c.   friction  
  d.   thermal  
  Hint    
      
  20.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    

 
   
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