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Motion and Speed

Practice Test
      
  1.Newton's first law of motion states that __________.  
  a.   when a force is applied on an object, there is an equal force applied by the object in the opposite direction  
  b.   acceleration is calculated by dividing the force exerted on an object by the mass of the object  
  c.   an object will remain at rest or keep moving unless a force acts on it  
  d.   when a force acts on an object, its acceleration is in the same direction as the force  
  Hint    
      
  2.The SI unit of distance is the __________.  
  a.   liter  
  b.   mile  
  c.   meter  
  d.   gram  
  Hint    
      
  3.Forces that cancel each other are called __________ forces.  
  a.   neutral  
  b.   null  
  c.   balanced  
  d.   inactivated  
  Hint    
      
  4.__________ is the distance an object travels per unit of time.  
  a.   Acceleration  
  b.   Velocity  
  c.   Displacement  
  d.   Speed  
  Hint    
      
  5.The distance between an object and a reference point is the object's __________.  
  a.   displacement  
  b.   neutral point  
  c.   velocity  
  d.   position  
  Hint    
      
  6.If a runner maintains a constant speed of 12 km/h, how long will it take to complete a marathon race of 26.2 miles?  
  a.   5.3 h  
  b.   2.18 h  
  c.   3.14 h  
  d.   3.52 h  
  Hint    
      
  7.If a student leaves home at 7:30 AM to walk to his school 2 km away, stops at a neighbor's house for 15 min, then arrives at school at 8:00 AM, what is the student's average speed for the trip to school?  
  a.   8 km/h  
  b.   4 km/h  
  c.   2 km/h  
  d.   2.67 km/h  
  Hint    
      
  8.The distance between the final position and the starting position is the __________.  
  a.   velocity  
  b.   displacement  
  c.   acceleration  
  d.   differential  
  Hint    
      
  9.The direction and speed of an object is described by its __________.  
  a.   displacement  
  b.   average speed  
  c.   average displacement  
  d.   velocity  
  Hint    
      
  10.Average speed is found by __________.  
  a.   multiplying the displacement by the total time spent  
  b.   dividing total distance traveled by the total time  
  c.   multiplying total distance traveled by the total time  
  d.   dividing the displacement by the total time spent  
  Hint    
      
  11.The __________ is the combination of all the forces acting on an object.  
  a.   inertia  
  b.   net force  
  c.   direction of motion  
  d.   force pair  
  Hint    
      
  12.__________ is the change in velocity divided by the time needed for the change to occur.  
  a.   Acceleration  
  b.   Displacement  
  c.   Average velocity  
  d.   Speed  
  Hint    
      
  13.If you travel 1.7 km north from your house at noon, and at 6:00 PM you travel 5.4 km south, what is your displacement?  
  a.   7.1 km south  
  b.   3.7 km south  
  c.   3.7 km  
  d.   7.1 km north  
  Hint    
      
  14.__________ is the speed of an object at any instant of time.  
  a.   Acceleration  
  b.   Average speed  
  c.   Instantaneous speed  
  d.   Velocity  
  Hint    
      
  15.Which of the following is not an acceleration?  
  a.   slowing your bike ride so you can make it up a hill  
  b.   riding your bike faster when you ride down a hill  
  c.   riding your bike straight down the street at a constant speed  
  d.   stopping your bike at an intersection  
  Hint    
      
  16.Motion occurs when an object changes its __________.  
  a.   mass  
  b.   force  
  c.   volume  
  d.   position  
  Hint    
      
  17.A(n) __________ is a push or a pull that one body exerts on another.  
  a.   acceleration  
  b.   force  
  c.   motion  
  d.   velocity  
  Hint    
      
  18.Which of the following devices is used to indicate instantaneous speed?  
  a.   compass  
  b.   speedometer  
  c.   odometer  
  d.   stopwatch  
  Hint    
      
  19.Any change over time is called a(n) __________.  
  a.   rate  
  b.   speed  
  c.   acceleration  
  d.   velocity  
  Hint    
      
  20.Changes in which of the following of Earth's layers cause earthquakes?  
  a.   magnetosphere  
  b.   lithosphere  
  c.   stratosphere  
  d.   core  
  Hint    

 
   
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