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Practice Test
  1.What is a joule?  
  a.   the unit of force required to move 1 kg of mass 1 m/s/s  
  b.   a unit of energy that depends on both an object's mass and velocity  
  c.   the unit of measurement describing the change in velocity in a unit time  
  d.   a unit measuring the amount of energy we get from various foods  
  2.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 mechanical energy increases.  
  c.   Its kinetic and potential energies remain constant.  
  d.   Its kinetic energy decreases and its potential energy increases.  
  3.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.   125,000 J  
  c.   1,250 J  
  d.   250 J  
  4.What two factors determine how much kinetic energy an object has?  
  a.   speed and position  
  b.   position and mass  
  c.   speed and mass  
  d.   speed and surface area  
  5.Which of the following objects has kinetic energy?  
  a.   a sunny windowsill  
  b.   a ball rolling across the floor  
  c.   leaves lying on the ground beneath a tree  
  d.   a bicycle parked at the top of a hill  
  6.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 of the object and its position relative to the ground  
  c.   shape and speed of the object  
  d.   weight and speed of the object  
  7.One food Calorie is equivalent to approximately __________.  
  a.   4 J  
  b.   4,000 J  
  c.   400 J  
  d.   40 J  
  8.Without changing the mass of a moving object, doubling its velocity will __________ its kinetic energy.  
  a.   triple  
  b.   not affect  
  c.   double  
  d.   quadruple  
  9.Energy stored in chemical bonds is __________.  
  a.   thermal potential energy  
  b.   chemical potential energy  
  c.   chemical kinetic energy  
  d.   energy of activation  
  10.What two factors determine how much potential energy an object has?  
  a.   mass and position  
  b.   speed and mass  
  c.   speed and position  
  d.   speed and surface area  
  11.The __________ is the SI unit of energy.  
  a.   volt  
  b.   joule  
  c.   watt  
  d.   ampere  
  12.Which of the following is NOT a form of energy?  
  a.   thermal  
  b.   chemical  
  c.   friction  
  d.   electrical  
  13.By what process does the Sun produce enough energy to warm Earth?  
  a.   catabolism  
  b.   transformation of thermal energy into kinetic energy  
  c.   nuclear fusion  
  d.   glycolysis  
  14.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 the mechanical and kinetic energies of the baseball are equal  
  c.   when it leaves the bat  
  d.   when it hits the ground  
  15.Which of the following objects has potential energy?  
  a.   a ball rolling across the floor  
  b.   a bowling ball knocking over a pin  
  c.   a glass sitting on a table  
  d.   a bicycle coasting down a hill  
  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.   3,675 J  
  c.   147 J  
  d.   15 J  
  17.__________ is the ability to cause change.  
  a.   Work  
  b.   Momentum  
  c.   Power  
  d.   Energy  
  18.Carbohydrates and proteins each supply about __________ Calories of energy per gram.  
  a.   4  
  b.   400  
  c.   14  
  d.   40  
  19.__________ is the energy stored in an object due to its position.  
  a.   Entropy  
  b.   Thermal energy  
  c.   Kinetic energy  
  d.   Potential energy  
  20.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  

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