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Quizzes Quiz

Practice Test
  1.__________ is the energy stored in an object due to its position.  
  a.   Potential energy  
  b.   Thermal energy  
  c.   Entropy  
  d.   Kinetic energy  
  2.During energy transformations, energy is never __________.  
  a.   used to increase an object's potential energy  
  b.   released as heat  
  c.   completely transformed  
  d.   created or destroyed  
  3.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 reaches its highest point  
  c.   when the mechanical and kinetic energies of the baseball are equal  
  d.   when it hits the ground  
  4.What is a joule?  
  a.   a unit of energy that depends on both an object's mass and velocity  
  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 measuring the amount of energy we get from various foods  
  5.How much gravitational potential energy does a 75-kg diver have stepping off the edge of a 5-m platform?  
  a.   147 J  
  b.   15 J  
  c.   375 J  
  d.   3,675 J  
  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.   weight and speed of the object  
  d.   shape and speed of the object  
  7.__________ is the ability to cause change.  
  a.   Momentum  
  b.   Power  
  c.   Work  
  d.   Energy  
  8.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.   2,500 J  
  c.   125,000 J  
  d.   250 J  
  9.The law of conservation of energy states that __________.  
  a.   energy cannot be created or destroyed  
  b.   energy is not created or destroyed and its form is constant  
  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  
  10.__________ is energy stored by things that stretch or compress.  
  a.   Elastic potential energy  
  b.   Chemical kinetic energy  
  c.   Gravitational potential  
  d.   Elastic kinetic energy  
  11.As energy transformations occur within a system, the total energy of the system __________.  
  a.   is transferred out of the system  
  b.   decreases  
  c.   increases  
  d.   remains constant  
  12.Without changing the mass of a moving object, doubling its velocity will __________ its kinetic energy.  
  a.   double  
  b.   quadruple  
  c.   triple  
  d.   not affect  
  13.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 kinetic energy decreases and its potential energy increases.  
  c.   Its mechanical energy increases.  
  d.   Its kinetic and potential energies remain constant.  
  14.Carbohydrates and proteins each supply about __________ Calories of energy per gram.  
  a.   14  
  b.   4  
  c.   40  
  d.   400  
  15.What two factors determine how much kinetic energy an object has?  
  a.   speed and surface area  
  b.   position and mass  
  c.   speed and position  
  d.   speed and mass  
  16.What two factors determine how much potential energy an object has?  
  a.   mass and position  
  b.   speed and position  
  c.   speed and surface area  
  d.   speed and mass  
  17.Which of the following objects has kinetic energy?  
  a.   a sunny windowsill  
  b.   a bicycle parked at the top of a hill  
  c.   a ball rolling across the floor  
  d.   leaves lying on the ground beneath a tree  
  18.One food Calorie is equivalent to approximately __________.  
  a.   4 J  
  b.   40 J  
  c.   4,000 J  
  d.   400 J  
  19.Which of the following objects has potential energy?  
  a.   a ball rolling across the floor  
  b.   a bicycle coasting down a hill  
  c.   a glass sitting on a table  
  d.   a bowling ball knocking over a pin  
  20.The __________ is the SI unit of energy.  
  a.   joule  
  b.   volt  
  c.   watt  
  d.   ampere  

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