The friction which comes to play when surfaces of the objects are at rest relative to each other
A) static friction
B) sliding friction
C) rolling friction
D) none of these
1 Answers
Talk Doctor Online in Bissoy App
In case of coefficient of static friction (µs), kinetic friction (µk) and rolling friction (µr), which of the following relation is true
Correct option is: (A) µs > µk > µr
2 Answers 1 views
A transparent material is bounded by two surfaces of which one (or) both – surfaces are spherical is called
Correct option is D) lens
2 Answers 2 views
If there is no friction a moving ball A) comes to rest
B) moves in uniform motion
2 Answers 1 views
In a senior secondary school,80 students play football or hockey.The number that play football is 5 more than twice the number that play hockey.If 15 students play both games and every student in the school plays at least one game,find (i)the number of students that play football (ii)the number of students that play football but not hockey (iii)the number of students that play hockey but not football.
I thought F or H = 80 is giving by n(F u H) = n(F) + n(H) - n(F n H)
2 Answers 8 views
The force which opposes the relative motion of two surfaces of the bodies which are in contact is called
B) frictional force
2 Answers 1 views
Friction is caused by the ………….. on the two surfaces which are in contact,
Correct option is B) ii and iii
2 Answers 1 views
Because of friction …………. of surfaces increases.
C) temperature
2 Answers 1 views
Friction occurs due to? A) Smoothness of the surfaces in contact
C) Irregularities of the surfaces in contact
2 Answers 1 views
Assertion: Ammonia is generaiiy excreted by diffusion across body surfaces or through gin surfaces (in fish) as ammonium ions. Reason: Ammonia is rea
Correct Answer - A Ammonia, as it is readily soluble, is generally excreted by diffusion across body surfaces or through gill surfaces (in fish) as ammonium ions. Kidneys do not play...
2 Answers 1 views