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Friction Important questions



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Question 1.
FILL IN THE BLANKS:
  1. __________ acts opposite to the direction of motion.
  2. Friction results when two or more surfaces are in _____________.
  3. __________ tries to keep the objects at rest.
  4. Sliding friction is _________ than static friction.
  5. Rolling friction is _________ than static friction.

Question 2.
STATE WHETHER THE STATEMENT IS TRUE OR FALSE:
  1. Factors that affect friction are water and air.
  2. A swimmer wears an astronaut suit while swimming.
  3. Friction helps us to write.
  4. Spikes are used to build the bottom of shoes to maintain the friction.
  5. A smooth surface has more irregularities than a rough surface.

Question 3.
UNSCRAMBLE THE WORDS:
  1. RICFOINT
  2. URFACES
  3. YNADICM
  4. AGRD
  5. LUBIRANCT

Question 4.
Match the column


Question 5.
Name the following words:
  1. It is a force that opposes the direction of motion when two surfaces are in contact.
  2. The maximum friction that is required to move an object to other object’s surface.
  3. A substance that forms a thin layer between the two surfaces in contact.
  4. Pointed nails in the bottom of shoes that help to maintain the friction while walking and running.
  5. Frictional force that resists the rolling body to move in other surface.
  6. Frictional force that resists the body to sliding in other surface.
  7. This solution is used to reduce friction which is slippery in nature.
  8. The deep grooves present in tyres of vehicles like bus, truck and motorbikes etc. increases friction between tyres and road.
  9. This material provides more friction than nails.

Question 6.
Very short answer type questions:
(i)Write any two types of friction.
(ii)Give one example of rolling friction.
(iii)Give one example of sliding friction.
(iv)Why cricketers use rubber grip?
(v)Why weightlifters apply powder while lifting the weight?

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