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Energy

Practice Test
      
  1.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    
      
  2.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    
      
  3.What two factors determine how much kinetic energy an object has?  
  a.   speed and mass  
  b.   speed and position  
  c.   position and mass  
  d.   speed and surface area  
  Hint    
      
  4.Energy stored in chemical bonds is __________.  
  a.   energy of activation  
  b.   chemical potential energy  
  c.   chemical kinetic energy  
  d.   thermal potential energy  
  Hint    
      
  5.Which of the following vehicles has the most kinetic energy?  
  a.   a 900-kg car traveling 80 km/h  
  b.   a 2000-kg truck traveling 50 km/h  
  c.   a 1,100-kg car traveling 60 km/h  
  d.   a 300-kg motorcycle traveling 100 km/h  
  Hint    
      
  6.Which of the following statements about an apple falling from a tree is true?  
  a.   Its mechanical energy increases.  
  b.   Its kinetic and potential energies remain constant.  
  c.   Its kinetic energy decreases and its potential energy increases.  
  d.   Its potential energy decreases and its kinetic energy increases.  
  Hint    
      
  7.Carbohydrates and proteins each supply about __________ Calories of energy per gram.  
  a.   14  
  b.   400  
  c.   40  
  d.   4  
  Hint    
      
  8.Without changing the mass of a moving object, doubling its velocity will __________ its kinetic energy.  
  a.   triple  
  b.   quadruple  
  c.   double  
  d.   not affect  
  Hint    
      
  9.The __________ is the SI unit of energy.  
  a.   ampere  
  b.   watt  
  c.   joule  
  d.   volt  
  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 reaches its highest point  
  b.   when it hits the ground  
  c.   when it leaves the bat  
  d.   when the mechanical and kinetic energies of the baseball are equal  
  Hint    
      
  11.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 and speed of the object  
  d.   weight of the object and height above the ground  
  Hint    
      
  12.One food Calorie is equivalent to approximately __________.  
  a.   4 J  
  b.   400 J  
  c.   4,000 J  
  d.   40 J  
  Hint    
      
  13.By what process does the Sun produce enough energy to warm Earth?  
  a.   transformation of thermal energy into kinetic energy  
  b.   nuclear fusion  
  c.   catabolism  
  d.   glycolysis  
  Hint    
      
  14.__________ is energy stored by things that stretch or compress.  
  a.   Chemical kinetic energy  
  b.   Elastic potential energy  
  c.   Elastic kinetic energy  
  d.   Gravitational potential  
  Hint    
      
  15.__________ is the energy stored in an object due to its position.  
  a.   Potential energy  
  b.   Thermal energy  
  c.   Entropy  
  d.   Kinetic energy  
  Hint    
      
  16.What is a joule?  
  a.   the unit of force required to move 1 kg of mass 1 m/s/s  
  b.   a unit of energy that depends on both an object's mass and velocity  
  c.   the unit of measurement describing the change in velocity in a unit time  
  d.   a unit measuring the amount of energy we get from various foods  
  Hint    
      
  17.The total amount of potential and kinetic energy in a system is called __________.  
  a.   complete energy  
  b.   energy maximum  
  c.   mechanical energy  
  d.   thermal energy  
  Hint    
      
  18.What two factors determine how much potential energy an object has?  
  a.   speed and mass  
  b.   speed and position  
  c.   speed and surface area  
  d.   mass and position  
  Hint    
      
  19.During energy transformations, energy is never __________.  
  a.   created or destroyed  
  b.   completely transformed  
  c.   used to increase an object's potential energy  
  d.   released as heat  
  Hint    
      
  20.Which of the following is NOT a form of energy?  
  a.   chemical  
  b.   electrical  
  c.   friction  
  d.   thermal  
  Hint    

 
   
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