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Laws of Motion

51 questions · Physics · NEET
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Laws of Motion

51 questions · Physics · NEET

  1. There are two inclined surfaces of equal length (L) and same angle of inclination 45∘ with the horizontal. One of them is rough and the other is perfectly smooth. A given body takes 2 times as much time to slide down on rough…2025 · Q149 · MCQ
  2. A horizontal force 10 N is applied to a block A as shown in figure. The mass of blocks A and B are 2 kg and 3 kg respectively. The blocks slide over a frictionless surface. The force exerted by… Includes diagram2024 · Q157 · MCQ
  3. A particle moving with uniform speed in a circular path maintains:2024 · Q167 · MCQ
  4. A box of mass 5 kg is pulled by a cord, up along a frictionless plane inclined at 30∘ with the horizontal. The tension in the cord is 30 N. The acceleration of the box is (Take g=10 m s−2…2024 · Q185 · MCQ
  5. A block of mass 2 kg is placed on inclined rough surface AC (as shown in figure) of coefficient of friction μ. If g = 10 m s−2, the net force (in N) on the block will be: Includes diagram2023 · Q164 · MCQ
  6. A football player is moving southward and suddenly turns eastward with the same speed to avoid an opponent. The force that acts on the player while turning is :2023 · Q153 · MCQ
  7. Calculate the maximum acceleration of a moving car so that a body lying on the floor of the car remains stationary. The coefficient of static friction between the body and the floor is 0.15 $$\left(g=10 \mathrm{~m}…2023 · Q159 · MCQ
  8. A bullet from a gun is fired on a rectangular wooden block with velocity u. When bullet travels 24 cm through the block along its length horizontally, velocity of bullet becomes 3u​. Then it further penetrates into…2023 · Q166 · MCQ
  9. If F=2i+j​−k and r=3i+2j​−2k, then the scalar and vector products of F and r have the magnitudes…2022 · Q162 · MCQ
  10. In the diagram shown, the normal reaction force between 2 kg and 1 kg is (Consider the surface, to be smooth) : (Given g = 10 ms−2) Includes diagram2022 · Q166 · MCQ
  11. Two bodies of mass 4 kg and 6 kg are tied to the ends of a massless string. The string passes over a pulley which is frictionless (see figure). The acceleration of the system in terms of acceleration due to gravity (g) is : Includes diagram2020 · Q143 · MCQ
  12. A block of mass 10 kg is in contact against the inner wall of a hollow cylindrical drum of radius 1 m. The coefficient of friction between the block and the inner wall of the cylinder is 0.1. The minimum angular velocity needed for the…2019 · Q152 · MCQ
  13. A mass m is attached to a thin wire and whirled in a vertical circle. The wire is most likely to break when :2019 · Q156 · MCQ
  14. Which one of the following statements is incorrect?2018 · Q139 · MCQ
  15. 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 · Q141 · MCQ
  16. 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 · Q147 · MCQ
  17. 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 · Q148 · MCQ
  18. 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 · Q143 · MCQ
  19. 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 · Q131 · MCQ
  20. 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 · Q132 · MCQ
  21. 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 · Q137 · MCQ
  22. 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 · Q138 · MCQ
  23. A balloon with mass m is descending down with an acceleration a (where a < g). How much mass should be removed from it so that it starts moving up with an acceleration a ?2014 · Q142 · MCQ
  24. A system consists of three masses m1, m2 and m3 connected by a string passing over a pulley P. The mass m1 hangs freely and m2 and m3 are on a rough horizontal table (the coefficient of friction = μ). The pulley is frictionless and of… Includes diagram2014 · Q143 · MCQ
  25. A car is moving in a circular horizontal track of radius 10 m with a constant speed of 10 m/s. A bob is suspended from the roof of the car by a light wire of length 1.0 m. The angle made by the wire with the vertical is2013 · Q148 · MCQ
  26. The upper half of an inclined plane of inclination θ is perfectly smooth while lower half is rough. A block starting from rest at the top of the plane will again come to rest at the bottom, if the coefficient of friction between…2013 · Q145 · MCQ
  27. Three blocks with masses m, 2m and 3m are connected by strings, as shown in the figure. After an upward force F is applied on block m, the masses move upwards at constant speed v. What is the net force on the block of mass 2m ? (g is the… Includes diagram2013 · Q146 · MCQ
  28. A stone is dropped from a height h. It hits the ground with a certain momentum P. If the same stone is dropped from a height 100% more than the previous height, the momentum when it hits the ground will change by2012 · Q106 · MCQ
  29. A conveyor belt is moving at a constant speed of 2 ms−1. A box is gently dropped on it. The coefficient of friction between them is μ = 0.5. The distance that the box will move relativce to belt before coming to rest on it, taking g…2011 · Q105 · MCQ
  30. A person of mass 60 kg is inside a lift of mass 940 kg and presses the button on control panel. The lift starts moving upwards with an acceleration 1.0 m/s2. If g = 10 ms−2, the tension in the supporting cable is2011 · Q149 · MCQ
  31. A body of mass M hits normally a rigid wall with velocity V and bounces back with the same velocity. The impulse experienced by the body is2011 · Q150 · MCQ
  32. A block of mass m is in contact with the cart C as shown in the figure. The coefficient of static friction between the block and the cart is μ. The acceleration α of the cart that will prevent the block from falling satisfies Includes diagram2010 · Q169 · MCQ
  33. The mass of a lift is 2000 kg. When the tension in the supporting cable is 28000 N, then its acceleration is :2009 · Q155 · MCQ
  34. A body, under the action of a force F=6i−8j​+10k, acquires an accelerations of 1 m/s2. The mass of this body must be2009 · Q156 · MCQ
  35. A roller coaster is designed such that riders experience ''weightlessness'' as they go round the top of a hill whose radius of curvature is 20 m. The speed of the car at the top of the hill is between2008 · Q151 · MCQ
  36. Sand is being dropped on a conveyer belt at the rate of M kg/s. The force necessary to keep the belt moving with a constant velocity of υ m/s will be :2008 · Q152 · MCQ
  37. Three forces acting on a body are shown in the figure. To have the resultant force only along the y-direction, the magnitude of the minimum additional force needed is Includes diagram2008 · Q153 · MCQ
  38. A block B is pushed momentarily along a horizontaly surface with an initial velocity V. If μ is the coefficient of sliding friction between B and the surface, block B will come to rest after a time Includes diagram2007 · Q134 · MCQ
  39. A block of mass m is placed on a smooth wedge of inclination θ. The whole system is accelerated horizontally so that the block does not slip on the wedge. The force exerted by the wedge on the block will be (g is acceleration due…2004 · Q142 · MCQ
  40. The coefficient of static friction, μs, between block A of mass 2 kg and the table as shown in the figure is 0.2. What would be the maximum mass value of block B so that the two blocks do not move? The string and the pulley are… Includes diagram2004 · Q143 · MCQ
  41. A man weight 80 kg. He stands on a weighting scale in a lift which is moving upwards with a uniform acceleration of 5 m/s2. What would be the reading on the scale ? (g = 10 m/s2)2003 · Q155 · MCQ
  42. A monkey of mass 20 kg is holding a vertical rope. The rope will not break when a mass of 25 kg is suspended from it but will break if the mass exceeds 25 kg. What is the maximum acceleration with which the monkey can climb up along the…2003 · Q156 · MCQ
  43. A lift of mass 1000 kg which is moving with acceleration of 1 m/s2 in upward direction, then the tension developed in string which is connected to lift is2002 · Q154 · MCQ
  44. A block of mass 10 kg placed on rough horizontal surface having coefficient of friction m = 0.5, if a horizontal force of 100 N acting on it then acceleration of the block will be2002 · Q155 · MCQ
  45. An object of mass 3 kg is at rest. Now a force of F = 6t2 i + 4t j​ is applied on the object then velocity of object at t = 3 sec. is2002 · Q174 · MCQ
  46. 250 N force is required to raise 75 kg mass from a pulley. If rope is pulled 12 m then the load is lifted to 3 m. the efficiency of pulley system will be2001 · Q152 · MCQ
  47. On the horizontal surface of a truck a block of mass 1 kg is placed (m = 0.6) and truck is moving with acceleration 5 m/sec2 then the frictional force on the block will be2001 · Q153 · MCQ
  48. A cricketer catches a ball of mass 150 gm in 0.1 sec moving with speed 20 m/s, then he experiences force of2001 · Q154 · MCQ
  49. A 1 kg stationary bomb is exploted in three parts having mass 1 : 1 : 3 respectively. Parts having same mass move in perpendicular direction with velocity 30 m/s, then the velocity of bigger part will be2001 · Q155 · MCQ
  50. A body of mass 3 kg hits a wall at an angle of 60o and returns at the same angle. The impact time was 0.2 sec. The force exerted on the wall Includes diagram2000 · Q149 · MCQ
  51. Two masses as shown in the figure are suspended from a massless pulley. The acceleration of the system when masses are left free is Includes diagram2000 · Q150 · MCQ