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Practice Test
  1.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 potential energy decreases and its kinetic energy increases.  
  c.   Its kinetic and potential energies remain constant.  
  d.   Its mechanical energy increases.  
  2.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.   125,000 J  
  b.   250 J  
  c.   1,250 J  
  d.   2,500 J  
  3.The __________ is the SI unit of energy.  
  a.   volt  
  b.   watt  
  c.   ampere  
  d.   joule  
  4.The law of conservation of energy states that __________.  
  a.   energy is not created or destroyed and its form is constant  
  b.   energy can be created and destroyed but cannot change form  
  c.   energy cannot be created or destroyed  
  d.   when energy is transformed, the total energy of a system is less than it was before the change  
  5.Without changing the mass of a moving object, doubling its velocity will __________ its kinetic energy.  
  a.   triple  
  b.   double  
  c.   quadruple  
  d.   not affect  
  6.What two factors determine how much gravitational potential energy is in an object?  
  a.   shape of the object and its position relative to the ground  
  b.   shape and speed of the object  
  c.   weight of the object and height above the ground  
  d.   weight and speed of the object  
  7.Which of the following objects has kinetic energy?  
  a.   a ball rolling across the floor  
  b.   leaves lying on the ground beneath a tree  
  c.   a sunny windowsill  
  d.   a bicycle parked at the top of a hill  
  8.Energy stored in chemical bonds is __________.  
  a.   chemical kinetic energy  
  b.   energy of activation  
  c.   thermal potential energy  
  d.   chemical potential energy  
  9.__________ is the ability to cause change.  
  a.   Work  
  b.   Power  
  c.   Energy  
  d.   Momentum  
  10.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  
  11.By what process does the Sun produce enough energy to warm Earth?  
  a.   nuclear fusion  
  b.   transformation of thermal energy into kinetic energy  
  c.   catabolism  
  d.   glycolysis  
  12.Carbohydrates and proteins each supply about __________ Calories of energy per gram.  
  a.   400  
  b.   4  
  c.   14  
  d.   40  
  13.How much gravitational potential energy does a 75-kg diver have stepping off the edge of a 5-m platform?  
  a.   375 J  
  b.   3,675 J  
  c.   15 J  
  d.   147 J  
  14.__________ is the energy stored in an object due to its position.  
  a.   Kinetic energy  
  b.   Thermal energy  
  c.   Entropy  
  d.   Potential energy  
  15.Which of the following objects has potential energy?  
  a.   a bowling ball knocking over a pin  
  b.   a glass sitting on a table  
  c.   a ball rolling across the floor  
  d.   a bicycle coasting down a hill  
  16.Which of the following is NOT a form of energy?  
  a.   thermal  
  b.   chemical  
  c.   electrical  
  d.   friction  
  17.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  
  18.One food Calorie is equivalent to approximately __________.  
  a.   4,000 J  
  b.   400 J  
  c.   40 J  
  d.   4 J  
  19.The total amount of potential and kinetic energy in a system is called __________.  
  a.   energy maximum  
  b.   thermal energy  
  c.   mechanical energy  
  d.   complete energy  
  20.As energy transformations occur within a system, the total energy of the system __________.  
  a.   decreases  
  b.   increases  
  c.   remains constant  
  d.   is transferred out of the system  

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