Friction - Worksheets

CBSE Worksheet-01
Class–VIII Science (Friction)
  1. Force of friction does not depend upon:-
    1. weight of object in motion
    2. nature of surface in contact
    3. area of surfaces in contact
    4. external force applied on object
  2. If applied force is increased then friction will: -
    1. increase at the same rate
    2. decrease at the same rate
    3. increase at a different rate
    4. decrease at a different rate
  3. Which of the following is not a type of friction?
    1. static friction
    2. rolling friction
    3. kinetic friction
    4. magnetic friction
  4. That maximum force of friction when block just starts to move is: -
    1. highest friction
    2. limiting friction
    3. lowest friction
    4. sliding friction
  5. Match the column: -
    a. sliding frictioni) heat production
    b. static frictionii) applying brakes
    c. polishing surfacesiii) greater than kinetic friction
    d. advantage of frictioniv) greater than rolling friction
    e. disadvantage of frictionv) decreases friction
  6. Fill in the blanks: -
    1. Frictional force is caused by the interaction of a body with ______.
    2. None of the solid surfaces are perfectly ______.
    3. Two ______ surfaces when placed together meet only at certain points.
    4. The interlocking of the irregularities of the surfaces in contact causes ______.
    5. There is no relative motion between the two surfaces in contact in case of ______ friction.
  7. A ball moving on a horizontal surface stops after some time without applying any force. Why?
  8. Friction is wasteful at times so why we need to increase it in some cases?
  9. What will be the direction of friction in the following image?
  10. Write the correct words by putting letters in correct sequence-
    1. mendealrist
    2. blintucar
CBSE Worksheet-01
Class–VIII Science (Friction)
[Answer]
  1. c
  2. a
  3. d
  4. b
  5. a. iv, b. iii, c. v, d. ii, e. i.
    1. surroundings
    2. smooth
    3. rough
    4. friction
    5. static.
  7. The ball stops because the surface opposes the motion of the ball i.e., the ball experiences a force, which opposes its motion. This force is called the force of friction or simply friction.Frictional force is a contact force that works along the two surfaces in contact. It always opposes the relative motion between the two bodies in contact irrespective of the direction of motion.
  8. Friction is very much advantageous as well. Grooves are made on tyres to increase friction, which prevents the slipping of the vehicles, athletes wear shoes with spikes to increase their grip on ground and therefore friction, gymnasts use coarse substance on their hand to improve their grip etc.
    1. streamlined
    2. lubricant