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Energy

Practice Test
      
  1.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    
      
  2.The total amount of potential and kinetic energy in a system is called __________.  
  a.   mechanical energy  
  b.   thermal energy  
  c.   energy maximum  
  d.   complete energy  
  Hint    
      
  3.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    
      
  4.How much gravitational potential energy does a 75-kg diver have stepping off the edge of a 5-m platform?  
  a.   147 J  
  b.   3,675 J  
  c.   375 J  
  d.   15 J  
  Hint    
      
  5.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.   when energy is transformed, the total energy of a system is less than it was before the change  
  d.   energy cannot be created or destroyed  
  Hint    
      
  6.One food Calorie is equivalent to approximately __________.  
  a.   40 J  
  b.   4 J  
  c.   4,000 J  
  d.   400 J  
  Hint    
      
  7.__________ 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    
      
  8.During energy transformations, energy is never __________.  
  a.   used to increase an object's potential energy  
  b.   released as heat  
  c.   completely transformed  
  d.   created or destroyed  
  Hint    
      
  9.Which of the following is NOT a form of energy?  
  a.   electrical  
  b.   thermal  
  c.   chemical  
  d.   friction  
  Hint    
      
  10.Carbohydrates and proteins each supply about __________ Calories of energy per gram.  
  a.   400  
  b.   14  
  c.   40  
  d.   4  
  Hint    
      
  11.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    
      
  12.What two factors determine how much kinetic energy an object has?  
  a.   speed and surface area  
  b.   position and mass  
  c.   speed and mass  
  d.   speed and position  
  Hint    
      
  13.Energy stored in chemical bonds is __________.  
  a.   thermal potential energy  
  b.   chemical potential energy  
  c.   energy of activation  
  d.   chemical kinetic energy  
  Hint    
      
  14.__________ is the ability to cause change.  
  a.   Momentum  
  b.   Energy  
  c.   Work  
  d.   Power  
  Hint    
      
  15.__________ is the energy stored in an object due to its position.  
  a.   Thermal energy  
  b.   Entropy  
  c.   Potential energy  
  d.   Kinetic energy  
  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 leaves the bat  
  b.   when it reaches its highest point  
  c.   when the mechanical and kinetic energies of the baseball are equal  
  d.   when it hits the ground  
  Hint    
      
  17.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    
      
  18.By what process does the Sun produce enough energy to warm Earth?  
  a.   nuclear fusion  
  b.   catabolism  
  c.   transformation of thermal energy into kinetic energy  
  d.   glycolysis  
  Hint    
      
  19.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.   1,250 J  
  c.   2,500 J  
  d.   125,000 J  
  Hint    
      
  20.As energy transformations occur within a system, the total energy of the system __________.  
  a.   remains constant  
  b.   increases  
  c.   decreases  
  d.   is transferred out of the system  
  Hint    

 
   
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