3.
depend upo
object
(ii) rolling friction
(iv) static friction
4.
(ii) rolling friction
(iv) none of these
(iv) circular
Write True or False.
(a) If two suriaces are pressed hard
(b) Friction exerted on an doject
(c) Friction does not
(a) The frictional force exerted by fluids is called
(d) It is easier to roll an
(e) Friction can be increased
(1) A very smooth suriace ex-
Give reasons for each of the
(a) A ball rolling on the gro
Let Us Practise.
Multiple Choice Questions (MCQ)
Tick () the correct option.
(i) drag
(iii) sliding friction
(b) Sliding friction is less than
(i) static friction
(ii) both (i) and (ii)
(b) Aeroplanes and cars
(c) The best shape to reduce drag is
(c) It is difficult to write
(ii) square
(i) rectangular
(d) Shoes of athletes ha
(iii) streamline
(e) Machine parts are
( It is easier to roll =
(d) You slip while walking on ice because
(ii) friction is less
Very short answer ty
(i) friction is more
(iv) none of these
(a) Name the force
(iii) you are not walking carefully
(b) What type of st
(e) Friction is
(c) Write a disady
(i) a disadvantage
(d) Write one wa
(ii) an advantage
Short answer ty
(ii) neither an advantage nor a disadvantage
(a) Define frict
(iv) sometimes an advantage and sometimes a disadvantage
(b) What is do
(1) When ball bearings are used
(c) What is s
(i) friction increases
(ii) friction decreases
(d) Define
(iii) friction remains same
(iv) none of these
5.
6.
(e) On who
Long answ
7.
Answers
Explanation:
depend upo
object
(ii) rolling friction
(iv) static friction
4.
(ii) rolling friction
(iv) none of these
(iv) circular
Write True or False.
(a) If two suriaces are pressed hard
(b) Friction exerted on an doject
(c) Friction does not
(a) The frictional force exerted by fluids is called
(d) It is easier to roll an
(e) Friction can be increased
(1) A very smooth suriace ex-
Give reasons for each of the
(a) A ball rolling on the gro
Let Us Practise.
Multiple Choice Questions (MCQ)
Tick () the correct option.
(i) drag
(iii) sliding friction
(b) Sliding friction is less than
(i) static friction
(ii) both (i) and (ii)
(b) Aeroplanes and cars
(c) The best shape to reduce drag is
(c) It is difficult to write
(ii) square
(i) rectangular
(d) Shoes of athletes ha
(iii) streamline
(e) Machine parts are
( It is easier to roll =
(d) You slip while walking on ice because
(ii) friction is less
Very short answer ty
(i) friction is more
(iv) none of these
(a) Name the force
(iii) you are not walking carefully
(b) What type of st
(e) Friction is
(c) Write a disady
(i) a disadvantage
(d) Write one wa
(ii) an advantage
Short answer ty
(ii) neither an advantage nor a disadvantage
(a) Define frict
(iv) sometimes an advantage and sometimes a disadvantage
(b) What is do
(1) When ball bearings are used
(c) What is s
(i) friction increases
(ii) friction decreases
(d) Define
(iii) friction remains same
(iv) none of these
5.
6.
(e) On who
Long answ
7.