Friction CBSE Class VIII


Friction: The force which resists the motion of a body while moving on a surface is called friction.
Some properties of friction:
(i) Friction depends on the nature of surfaces in contact.
(ii) Frictional force does not depends on the surface area.
(iii) It is acts in a direction opposite to the direction of motion.
Sliding friction: The minimum force required to make a body just to slide over the surface is equal to the sliding friction.
Friction CBSE Class VIII 
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Choose the correct option:
(1) Where force of friction is grater-
(i) glass table     (ii) wooden floor   (iii) playground   (iv) marble tiles.
(2) Name the friction which comes to play when a body starts moving on table –
(ii) static friction   (ii) limiting friction   (iii) rolling friction  (iv) sliding friction.
(3) Name the better lubricant for machine parts –
(i) turpentine oil   (ii) water  (iii) chalk   (iv) air.
(4) The wheels which are used in suitcase because of –
(i) easy to carry   (ii) reduce noise   (iii) looks stylish  (iv) all. 
(5) The friction energy is mainly converted into –
(i) sound energy  (ii) chemical energy  (iii) heat energy  (iv) light energy.
(6) The tyres of truck designed into various pattern because of –
(i) to decrease friction   (ii) to increase friction   (iii) to save the rubber  (iv) to make it stylish.
(7) The friction between the two surface when there is no relative motion between them is called –
(i) viscous drag   (ii) rolling friction   (iii) static friction   ( sliding friction.
(8) Arrange them in ascending order: rolling, static and sliding friction.
(i) rolling<static<sliding   (ii)  static<rolling<sliding   (iii) sliding<rolling<static   (iv) rolling<sliding<static.
(9) Name the force which is create when an object  roll over another surface –
(i) limiting friction  (ii) sliding friction   (iii) static friction  (iv)  rolling friction.
(10) Walk on ice is difficult because –
(i) it is too cold  (ii) less friction   (iii) it is very soft   (iv) greater friction.
Answers:
(1) (iii)  Playground
(2) (iv) sliding friction
(3) (i) turpentine oil  
(4) (i) easy to carry  
(5) (iii) heat energy 
(6) (ii) to increase friction  
(7) (iii) static friction  
(8) (iv) rolling<sliding<static.
(9) (iv)  rolling friction
(10) (ii) less friction   
Friction CBSE Class VIII 

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