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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 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  
  2.During energy transformations, energy is never __________.  
  a.   released as heat  
  b.   created or destroyed  
  c.   completely transformed  
  d.   used to increase an object's potential energy  
  3.Which of the following objects has potential energy?  
  a.   a bicycle coasting down a hill  
  b.   a ball rolling across the floor  
  c.   a bowling ball knocking over a pin  
  d.   a glass sitting on a table  
  4.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 mechanical energy increases.  
  c.   Its kinetic and potential energies remain constant.  
  d.   Its potential energy decreases and its kinetic energy increases.  
  5.What two factors determine how much gravitational potential energy is in an object?  
  a.   weight and speed of the object  
  b.   shape and speed of the object  
  c.   weight of the object and height above the ground  
  d.   shape of the object and its position relative to the ground  
  6.__________ is energy stored by things that stretch or compress.  
  a.   Gravitational potential  
  b.   Chemical kinetic energy  
  c.   Elastic potential energy  
  d.   Elastic kinetic energy  
  7.Without changing the mass of a moving object, doubling its velocity will __________ its kinetic energy.  
  a.   triple  
  b.   double  
  c.   quadruple  
  d.   not affect  
  8.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  
  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.   1,250 J  
  b.   125,000 J  
  c.   250 J  
  d.   2,500 J  
  10.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  
  11.The total amount of potential and kinetic energy in a system is called __________.  
  a.   mechanical energy  
  b.   energy maximum  
  c.   complete energy  
  d.   thermal energy  
  12.A baseball is hit into the air with a bat. When does the baseball have the greatest gravitational potential energy?  
  a.   when it leaves the bat  
  b.   when it hits the ground  
  c.   when the mechanical and kinetic energies of the baseball are equal  
  d.   when it reaches its highest point  
  13.The law of conservation of energy states that __________.  
  a.   energy is not created or destroyed and its form is constant  
  b.   energy cannot be created or destroyed  
  c.   energy can be created and destroyed but cannot change form  
  d.   when energy is transformed, the total energy of a system is less than it was before the change  
  14.One food Calorie is equivalent to approximately __________.  
  a.   400 J  
  b.   40 J  
  c.   4,000 J  
  d.   4 J  
  15.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  
  16.What two factors determine how much kinetic energy an object has?  
  a.   speed and position  
  b.   speed and mass  
  c.   speed and surface area  
  d.   position and mass  
  17.By what process does the Sun produce enough energy to warm Earth?  
  a.   nuclear fusion  
  b.   glycolysis  
  c.   catabolism  
  d.   transformation of thermal energy into kinetic energy  
  18.__________ is the ability to cause change.  
  a.   Power  
  b.   Work  
  c.   Momentum  
  d.   Energy  
  19.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.   15 J  
  c.   147 J  
  d.   375 J  
  20.__________ is the energy stored in an object due to its position.  
  a.   Kinetic energy  
  b.   Thermal energy  
  c.   Entropy  
  d.   Potential energy  

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