Class VIII

Friction always acts _ the direction of motion of an object . 
  1. I n the same direction as 
  2. Perpendicular to 
  3. Opposite to 
  4. At 45 degrees angle to 
On what force of friction depends?
  1. Smoothness of surface
  2. Roughness of surface
  3. Inclination of surface
  4. All of these
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
Friction is a
  1. Contact force
  2. Non-contact force
  3. Magnetic force
  4. None of these
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
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