2 units
ence - VIII
2. Does friction make movement easier or more difficult?
3. What is friction? Is it contact or non-contact force?
4. Two blocks of iron of different masses are kept on a cemented floor as shown in
the figure. Which one of them would require a larger force to move it from the rest
[NCERT Exemplar]
position?
5. Two boys are riding their bicycles on the same concrete road. One has new tyres
on his bicycle while the other has tyres that are old and used. Which of them is
more likely to skid while moving through a patch of the road which has lubricating
oil spilled over it?
[NCERT Exemplar]
6. Imagine that an object is falling through a long straight glass tube held vertical; air has been removed
completely from the tube. The object does not touch the walls of the tube. Will the object experience
any force of friction?
[NCERT Exemplar]
7. The handle of a cricket bat or a badminton racquet is usually rough. Explain the reason.
[NCERT Exemplar]
8. Explain why the surface of mortar and pestle (silbatta) used for grinding is etched again after prolonged
[NCERT Exemplar]
use.
Answers
Answered by
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Answer:
2) friction makes moving POSSIBLE
3) friction is the opposing force of any object when it is in motions and is in contact with ground
4) the one with higher mass will require more force to move
5) the one with old tires would skid because the old tires wouldnt have good grip because they dont have grooves ,in tires that are as new as in the new tires
6) no
7) the handle of cricket bat or a badminton are made with a rubber coating ,so they dont slip from hands of the user
Explanation:
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