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Energy

Practice Test
      
  1.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    
      
  2.Carbohydrates and proteins each supply about __________ Calories of energy per gram.  
  a.   4  
  b.   40  
  c.   14  
  d.   400  
  Hint    
      
  3.__________ is the energy stored in an object due to its position.  
  a.   Potential energy  
  b.   Kinetic energy  
  c.   Entropy  
  d.   Thermal energy  
  Hint    
      
  4.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.   147 J  
  c.   375 J  
  d.   15 J  
  Hint    
      
  5.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 hits the ground  
  c.   when it leaves the bat  
  d.   when it reaches its highest point  
  Hint    
      
  6.During energy transformations, energy is never __________.  
  a.   used to increase an object's potential energy  
  b.   released as heat  
  c.   created or destroyed  
  d.   completely transformed  
  Hint    
      
  7.__________ is energy stored by things that stretch or compress.  
  a.   Chemical kinetic energy  
  b.   Gravitational potential  
  c.   Elastic kinetic energy  
  d.   Elastic potential energy  
  Hint    
      
  8.The law of conservation of energy states that __________.  
  a.   energy can be created and destroyed but cannot change form  
  b.   energy cannot be created or destroyed  
  c.   when energy is transformed, the total energy of a system is less than it was before the change  
  d.   energy is not created or destroyed and its form is constant  
  Hint    
      
  9.As energy transformations occur within a system, the total energy of the system __________.  
  a.   increases  
  b.   decreases  
  c.   remains constant  
  d.   is transferred out of the system  
  Hint    
      
  10.__________ is the ability to cause change.  
  a.   Power  
  b.   Work  
  c.   Momentum  
  d.   Energy  
  Hint    
      
  11.By what process does the Sun produce enough energy to warm Earth?  
  a.   catabolism  
  b.   transformation of thermal energy into kinetic energy  
  c.   glycolysis  
  d.   nuclear fusion  
  Hint    
      
  12.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.   1,250 J  
  b.   125,000 J  
  c.   2,500 J  
  d.   250 J  
  Hint    
      
  13.Energy stored in chemical bonds is __________.  
  a.   energy of activation  
  b.   thermal potential energy  
  c.   chemical kinetic energy  
  d.   chemical potential energy  
  Hint    
      
  14.The __________ is the SI unit of energy.  
  a.   ampere  
  b.   joule  
  c.   watt  
  d.   volt  
  Hint    
      
  15.What two factors determine how much gravitational potential energy is in an object?  
  a.   shape and speed of the object  
  b.   weight and speed of the object  
  c.   weight of the object and height above the ground  
  d.   shape of the object and its position relative to the ground  
  Hint    
      
  16.Which of the following vehicles has the most kinetic energy?  
  a.   a 900-kg car traveling 80 km/h  
  b.   a 1,100-kg car traveling 60 km/h  
  c.   a 300-kg motorcycle traveling 100 km/h  
  d.   a 2000-kg truck traveling 50 km/h  
  Hint    
      
  17.Which of the following statements about an apple falling from a tree is true?  
  a.   Its potential energy decreases and its kinetic energy increases.  
  b.   Its kinetic and potential energies remain constant.  
  c.   Its mechanical energy increases.  
  d.   Its kinetic energy decreases and its potential energy increases.  
  Hint    
      
  18.The total amount of potential and kinetic energy in a system is called __________.  
  a.   energy maximum  
  b.   complete energy  
  c.   mechanical energy  
  d.   thermal energy  
  Hint    
      
  19.What two factors determine how much kinetic energy an object has?  
  a.   position and mass  
  b.   speed and surface area  
  c.   speed and mass  
  d.   speed and position  
  Hint    
      
  20.Which of the following is NOT a form of energy?  
  a.   friction  
  b.   electrical  
  c.   thermal  
  d.   chemical  
  Hint    

 
   
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