Class VIII

Which of the following statement is NOT true?
  1. Friction make the things slow down
  2. Friction produces heat.
  3. Friction can stop the moving object.
  4. Friction is not useful.
Friction is a
  1. scalar quantity
  2. vector quantity
  3. neither (a) and (b)
  4. can be scalar or vector
What kind of substances are known as lubricants
  1. Increase friction
  2. Decrease friction
  3. Increase or decrease friction
  4. None of these
Friction is a /an
  1. Evil
  2. Foe
  3. Both (a) and (b)
  4. None
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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