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Practice Test
  1.A baseball is hit into the air with a bat. When does the baseball have the greatest gravitational potential energy?  
  a.   when it hits the ground  
  b.   when it leaves the bat  
  c.   when it reaches its highest point  
  d.   when the mechanical and kinetic energies of the baseball are equal  
  2.Carbohydrates and proteins each supply about __________ Calories of energy per gram.  
  a.   40  
  b.   400  
  c.   14  
  d.   4  
  3.Which of the following vehicles has the most kinetic energy?  
  a.   a 900-kg car traveling 80 km/h  
  b.   a 300-kg motorcycle traveling 100 km/h  
  c.   a 1,100-kg car traveling 60 km/h  
  d.   a 2000-kg truck traveling 50 km/h  
  4.Which of the following objects has kinetic energy?  
  a.   leaves lying on the ground beneath a tree  
  b.   a sunny windowsill  
  c.   a ball rolling across the floor  
  d.   a bicycle parked at the top of a hill  
  5.How much gravitational potential energy does a 75-kg diver have stepping off the edge of a 5-m platform?  
  a.   15 J  
  b.   3,675 J  
  c.   375 J  
  d.   147 J  
  6.What two factors determine how much gravitational potential energy is in an object?  
  a.   shape and speed of the object  
  b.   weight of the object and height above the ground  
  c.   weight and speed of the object  
  d.   shape of the object and its position relative to the ground  
  7.Which of the following objects has potential energy?  
  a.   a glass sitting on a table  
  b.   a bicycle coasting down a hill  
  c.   a ball rolling across the floor  
  d.   a bowling ball knocking over a pin  
  8.One food Calorie is equivalent to approximately __________.  
  a.   4,000 J  
  b.   40 J  
  c.   400 J  
  d.   4 J  
  9.__________ is energy stored by things that stretch or compress.  
  a.   Gravitational potential  
  b.   Elastic potential energy  
  c.   Chemical kinetic energy  
  d.   Elastic kinetic energy  
  10.By what process does the Sun produce enough energy to warm Earth?  
  a.   glycolysis  
  b.   catabolism  
  c.   nuclear fusion  
  d.   transformation of thermal energy into kinetic energy  
  11.As energy transformations occur within a system, the total energy of the system __________.  
  a.   remains constant  
  b.   decreases  
  c.   increases  
  d.   is transferred out of the system  
  12.What two factors determine how much kinetic energy an object has?  
  a.   position and mass  
  b.   speed and surface area  
  c.   speed and position  
  d.   speed and mass  
  13.What two factors determine how much potential energy an object has?  
  a.   mass and position  
  b.   speed and surface area  
  c.   speed and position  
  d.   speed and mass  
  14.Energy stored in chemical bonds is __________.  
  a.   chemical kinetic energy  
  b.   energy of activation  
  c.   chemical potential energy  
  d.   thermal potential energy  
  15.The __________ is the SI unit of energy.  
  a.   ampere  
  b.   watt  
  c.   joule  
  d.   volt  
  16.During energy transformations, energy is never __________.  
  a.   released as heat  
  b.   used to increase an object's potential energy  
  c.   completely transformed  
  d.   created or destroyed  
  17.Without changing the mass of a moving object, doubling its velocity will __________ its kinetic energy.  
  a.   double  
  b.   triple  
  c.   not affect  
  d.   quadruple  
  18.Which of the following is NOT a form of energy?  
  a.   friction  
  b.   chemical  
  c.   electrical  
  d.   thermal  
  19.__________ is the ability to cause change.  
  a.   Power  
  b.   Energy  
  c.   Momentum  
  d.   Work  
  20.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 mechanical energy increases.  
  d.   Its potential energy decreases and its kinetic energy increases.  

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