Sign in
12thPass logo
New chatPYQ LibraryDoubtsRank report
Sign in to see Recents

Your guest activity stays on this device

Sign in to save progress →
Sign in

Laws of Motion question

2018 · Q139
Guest · filters and generic practice availableBrowsing as a guest · PYQ filters and generic practice are available. Sign in only for personalised features and saved progress.
  1. PYQ Library
  2. /NEET
  3. /Physics
  4. /Laws of Motion
  5. /2018 · Q139

Laws of Motion question

2018 · Q139

NEETPhysicsLaws of MotionMCQ+4 / −1
Which one of the following statements is incorrect?
  1. A
    Rolling friction is smaller than sliding friction.
  2. B
    Limiting value of static friction is directly proportional to normal reaction.
  3. C
    Frictional force opposes the relative motion.
  4. D
    Coefficient of sliding friction has dimensions of length.
View written solutionFree

Correct answer: D

We know,

F = μ\mu μN

⇒\Rightarrow⇒ MLT–2 = μ\mu μMLT–2

⇒\Rightarrow⇒ μ\mu μ = M0L0T0

∴\therefore∴ Coefficient of sliding friction has no dimension.

PreviousNext

More from Laws of Motion

  • A block of mass m is placed on a smooth inclined wedge ABC of inclination q as shown in the figure. The wedge is given an acceleration ‘a’ towards the right. The relation between a and q for the block to remain stationary on the wedge is Includes diagram2018 · MCQ
  • One end of string of length l is connected to a particle of mass 'm' and the other end is connected to a small peg on a smooth horizontal table. If the particle moves in circle with speed 'υ', the net force on the particle…2017 · MCQ
  • Two blocks A and B of masses 3m and m respectively are connected by a massless and inextensible string. The whole system is suspended by a massless spring as shown in figure. The magnitudes of acceleration of A and B immediately after the… Includes diagram2017 · MCQ
  • A car is negotiating a curved road of radius R. The road is banked at an angle θ. The coefficient of friction between the tyres of the car and the road is μs. The maximum safe velocity on this road is2016 · MCQ
  • Two stones of masses m and 2m are whirled in horizontal circles, the heavier one in a radius 2r​ and the lighter one in radius r. The tangential speed of lighter stone is n times that of the value of heavier stone when they…2015 · MCQ
  • A plank with a box on it at one end is gradually raised about the other end. As the angle of inclination with the horizontal reaches 30o, the box starts to slip and slides 4.0 m down the plank in 4.0 s. The coefficients of static and… Includes diagram2015 · MCQ
  • A block A of mass m1 rests on a horizontal table. A light string connected to it passes over a frictionless pully at the edge of table and from its other end another block B of mass m2 is suspended. The coefficient of kinetic friction…2015 · MCQ
  • Three blocks A, B and C, of masses 4 kg, 2 kg and 1 kg respectively, are in contact on a frictionless surface, as shown. If a force of 14 N is applied on the 4 kg block, then the contact force between A and B is Includes diagram2015 · MCQ