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Energy

Practice Test
      
  1.The __________ is the SI unit of energy.  
  a.   volt  
  b.   joule  
  c.   ampere  
  d.   watt  
  Hint    
      
  2.__________ is the energy stored in an object due to its position.  
  a.   Potential energy  
  b.   Kinetic energy  
  c.   Entropy  
  d.   Thermal energy  
  Hint    
      
  3.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 the mechanical and kinetic energies of the baseball are equal  
  d.   when it leaves the bat  
  Hint    
      
  4.By what process does the Sun produce enough energy to warm Earth?  
  a.   transformation of thermal energy into kinetic energy  
  b.   glycolysis  
  c.   catabolism  
  d.   nuclear fusion  
  Hint    
      
  5.During energy transformations, energy is never __________.  
  a.   created or destroyed  
  b.   released as heat  
  c.   completely transformed  
  d.   used to increase an object's potential energy  
  Hint    
      
  6.What is a joule?  
  a.   a unit measuring the amount of energy we get from various foods  
  b.   the unit of measurement describing the change in velocity in a unit time  
  c.   the unit of force required to move 1 kg of mass 1 m/s/s  
  d.   a unit of energy that depends on both an object's mass and velocity  
  Hint    
      
  7.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    
      
  8.Carbohydrates and proteins each supply about __________ Calories of energy per gram.  
  a.   400  
  b.   14  
  c.   40  
  d.   4  
  Hint    
      
  9.What two factors determine how much potential energy an object has?  
  a.   speed and surface area  
  b.   speed and mass  
  c.   speed and position  
  d.   mass and position  
  Hint    
      
  10.As energy transformations occur within a system, the total energy of the system __________.  
  a.   increases  
  b.   remains constant  
  c.   decreases  
  d.   is transferred out of the system  
  Hint    
      
  11.Which of the following objects has kinetic energy?  
  a.   leaves lying on the ground beneath a tree  
  b.   a ball rolling across the floor  
  c.   a sunny windowsill  
  d.   a bicycle parked at the top of a hill  
  Hint    
      
  12.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    
      
  13.__________ is energy stored by things that stretch or compress.  
  a.   Elastic kinetic energy  
  b.   Elastic potential energy  
  c.   Chemical kinetic energy  
  d.   Gravitational potential  
  Hint    
      
  14.What two factors determine how much gravitational potential energy is in an object?  
  a.   weight of the object and height above the ground  
  b.   shape and speed of the object  
  c.   weight and speed of the object  
  d.   shape of the object and its position relative to the ground  
  Hint    
      
  15.Energy stored in chemical bonds is __________.  
  a.   chemical potential energy  
  b.   chemical kinetic energy  
  c.   energy of activation  
  d.   thermal potential energy  
  Hint    
      
  16.How much gravitational potential energy does a 75-kg diver have stepping off the edge of a 5-m platform?  
  a.   375 J  
  b.   15 J  
  c.   147 J  
  d.   3,675 J  
  Hint    
      
  17.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    
      
  18.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    
      
  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.   2,500 J  
  b.   1,250 J  
  c.   250 J  
  d.   125,000 J  
  Hint    
      
  20.Which of the following vehicles has the most kinetic energy?  
  a.   a 1,100-kg car traveling 60 km/h  
  b.   a 2000-kg truck traveling 50 km/h  
  c.   a 300-kg motorcycle traveling 100 km/h  
  d.   a 900-kg car traveling 80 km/h  
  Hint    

 
   
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