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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 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  
  2.During energy transformations, energy is never __________.  
  a.   completely transformed  
  b.   used to increase an object's potential energy  
  c.   released as heat  
  d.   created or destroyed  
  3.__________ is the energy stored in an object due to its position.  
  a.   Entropy  
  b.   Potential energy  
  c.   Thermal energy  
  d.   Kinetic energy  
  4.Energy stored in chemical bonds is __________.  
  a.   chemical potential energy  
  b.   energy of activation  
  c.   thermal potential energy  
  d.   chemical kinetic energy  
  5.By what process does the Sun produce enough energy to warm Earth?  
  a.   catabolism  
  b.   transformation of thermal energy into kinetic energy  
  c.   glycolysis  
  d.   nuclear fusion  
  6.The law of conservation of energy states that __________.  
  a.   energy can be created and destroyed but cannot change form  
  b.   when energy is transformed, the total energy of a system is less than it was before the change  
  c.   energy cannot be created or destroyed  
  d.   energy is not created or destroyed and its form is constant  
  7.Which of the following objects has kinetic energy?  
  a.   leaves lying on the ground beneath a tree  
  b.   a bicycle parked at the top of a hill  
  c.   a ball rolling across the floor  
  d.   a sunny windowsill  
  8.Without changing the mass of a moving object, doubling its velocity will __________ its kinetic energy.  
  a.   quadruple  
  b.   double  
  c.   not affect  
  d.   triple  
  9.What two factors determine how much potential energy an object has?  
  a.   mass and position  
  b.   speed and mass  
  c.   speed and surface area  
  d.   speed and position  
  10.Which of the following is NOT a form of energy?  
  a.   thermal  
  b.   electrical  
  c.   friction  
  d.   chemical  
  11.What two factors determine how much gravitational potential energy is in an object?  
  a.   weight and speed of the object  
  b.   weight of the object and height above the ground  
  c.   shape and speed of the object  
  d.   shape of the object and its position relative to the ground  
  12.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  
  13.__________ is energy stored by things that stretch or compress.  
  a.   Gravitational potential  
  b.   Chemical kinetic energy  
  c.   Elastic potential energy  
  d.   Elastic kinetic energy  
  14.As energy transformations occur within a system, the total energy of the system __________.  
  a.   is transferred out of the system  
  b.   remains constant  
  c.   increases  
  d.   decreases  
  15.One food Calorie is equivalent to approximately __________.  
  a.   4,000 J  
  b.   40 J  
  c.   400 J  
  d.   4 J  
  16.The total amount of potential and kinetic energy in a system is called __________.  
  a.   complete energy  
  b.   thermal energy  
  c.   mechanical energy  
  d.   energy maximum  
  17.The __________ is the SI unit of energy.  
  a.   ampere  
  b.   joule  
  c.   volt  
  d.   watt  
  18.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.   15 J  
  d.   147 J  
  19.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  
  20.What two factors determine how much kinetic energy an object has?  
  a.   speed and surface area  
  b.   speed and position  
  c.   speed and mass  
  d.   position and mass  

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