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Energy

Practice Test
      
  1.Which of the following objects has kinetic energy?  
  a.   a sunny windowsill  
  b.   leaves lying on the ground beneath a tree  
  c.   a ball rolling across the floor  
  d.   a bicycle parked at the top of a hill  
  Hint    
      
  2.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 reaches its highest point  
  c.   when it leaves the bat  
  d.   when it hits the ground  
  Hint    
      
  3.The total amount of potential and kinetic energy in a system is called __________.  
  a.   mechanical energy  
  b.   thermal energy  
  c.   complete energy  
  d.   energy maximum  
  Hint    
      
  4.What is a joule?  
  a.   the unit of force required to move 1 kg of mass 1 m/s/s  
  b.   a unit measuring the amount of energy we get from various foods  
  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    
      
  5.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.   375 J  
  c.   147 J  
  d.   15 J  
  Hint    
      
  6.The __________ is the SI unit of energy.  
  a.   joule  
  b.   ampere  
  c.   volt  
  d.   watt  
  Hint    
      
  7.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    
      
  8.Which of the following objects has potential energy?  
  a.   a bowling ball knocking over a pin  
  b.   a bicycle coasting down a hill  
  c.   a glass sitting on a table  
  d.   a ball rolling across the floor  
  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.   2,500 J  
  c.   1,250 J  
  d.   125,000 J  
  Hint    
      
  10.__________ is the energy stored in an object due to its position.  
  a.   Thermal energy  
  b.   Potential energy  
  c.   Entropy  
  d.   Kinetic energy  
  Hint    
      
  11.One food Calorie is equivalent to approximately __________.  
  a.   40 J  
  b.   400 J  
  c.   4,000 J  
  d.   4 J  
  Hint    
      
  12.Without changing the mass of a moving object, doubling its velocity will __________ its kinetic energy.  
  a.   double  
  b.   quadruple  
  c.   triple  
  d.   not affect  
  Hint    
      
  13.Which of the following statements about an apple falling from a tree is true?  
  a.   Its mechanical energy increases.  
  b.   Its potential energy decreases and its kinetic energy increases.  
  c.   Its kinetic energy decreases and its potential energy increases.  
  d.   Its kinetic and potential energies remain constant.  
  Hint    
      
  14.Which of the following vehicles has the most kinetic energy?  
  a.   a 300-kg motorcycle traveling 100 km/h  
  b.   a 1,100-kg car traveling 60 km/h  
  c.   a 2000-kg truck traveling 50 km/h  
  d.   a 900-kg car traveling 80 km/h  
  Hint    
      
  15.Carbohydrates and proteins each supply about __________ Calories of energy per gram.  
  a.   40  
  b.   14  
  c.   400  
  d.   4  
  Hint    
      
  16.During energy transformations, energy is never __________.  
  a.   created or destroyed  
  b.   released as heat  
  c.   used to increase an object's potential energy  
  d.   completely transformed  
  Hint    
      
  17.Energy stored in chemical bonds is __________.  
  a.   chemical kinetic energy  
  b.   energy of activation  
  c.   chemical potential energy  
  d.   thermal potential energy  
  Hint    
      
  18.__________ is the ability to cause change.  
  a.   Work  
  b.   Momentum  
  c.   Power  
  d.   Energy  
  Hint    
      
  19.Which of the following is NOT a form of energy?  
  a.   thermal  
  b.   electrical  
  c.   chemical  
  d.   friction  
  Hint    
      
  20.What two factors determine how much potential energy an object has?  
  a.   mass and position  
  b.   speed and position  
  c.   speed and mass  
  d.   speed and surface area  
  Hint    

 
   
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