Class VIII

The shape of the airplane is like a
  1. bird
  2. car
  3. dog
  4. all
Which one of these characteristics does a smooth surface has?
  1. Less frictional force
  2. More frictional force
  3. Sometimes less and sometimes more force
  4. All of above
An object is at rest on a floor, a force is applied to move that object. Which friction force will come into an action at this moment?
  1. Sliding Friction
  2. Static Friction
  3. Rolling Friction
  4. Fluid Friction
Friction always acts __________ the direction of motion of an object
  1. in the same direction as
  2. perpendicular to
  3. opposite to
  4. at 45 degrees angle to
Complete the sentence. Friction always
  1. helps the motion
  2. opposes the motion
  3. Both of these
  4. None of these
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