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Laws of Motion

JEE Mains Physics. Try each one first, then open its answer.

Top 10 JEE Mains PYQs to practise first

The questions and kinds of question asked most often come first. Each one says how often and in which papers.

  1. Question 1

    This type asked 5 times: 2021 Paper 24, 29 Jan 2023, 8 Apr 2024, 4 Apr 2026 S1, 6 Apr 2026 S2. This one: 6 Apr 2026 S2 See all 5 of this type

    21
    A block takes tt time to slide down a plane inclined at 45∘45^{\circ} to the horizontal. If the surface is made smooth (frictionless), the block takes times t2\frac{t}{2} to slide down the plane. The coefficient of friction between the block and the inclined plane is (α100)\left( \frac{\alpha}{100} \right) . The value of α\alpha is ____\_\_\_\_.

  2. Question 2

    This type asked 5 times: 2021 Paper 25, 26 Jun 2022, 29 Jun 2022, 24 Jan 2023, 5 Apr 2024. This one: 5 Apr 2024 See all 5 of this type

    14
    A wooden block of mass 5 kg5\text{ }kg rests on soft horizontal floor. When an iron cylinder of mass 25 kgkg is placed on the top of the block, the floor yields and the block and the cylinder together go down with an acceleration of 0.1 ms−20.1{\text{ }ms}^{- 2}. The action force of the system on the floor is equal to:

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  3. Question 3

    This type asked 4 times: 2021 Paper 5, 2021 Paper 25, 1 Feb 2023, 4 Apr 2025. This one: 4 Apr 2025 See all 4 of this type

    89
    A block of mass 25 kg is pulled along a horizontal surface by a force at an angle 45∘45^{\circ} with the horizontal. The friction coefficient between the block and the surface is 0.25 . If the block moves with uniform velocity, the work done by the force for a displacement of 5 m of the block is:

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  4. Question 4

    This type asked 4 times: 26 Jul 2022, 31 Jan 2024, 6 Apr 2024, 9 Apr 2024. This one: 9 Apr 2024 See all 4 of this type

    8
    A light unstretchable string passing over a smooth light pulley connects two blocks of masses m1m_{1} and m2m_{2}. If the acceleration of the system is g8\frac{g}{8}, then the ratio of the masses m2 m1\frac{m_{2}}{{\text{ }m}_{1}} is:

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  5. Question 5

    This type asked 3 times: 29 Jan 2024, 30 Jan 2024, 5 Apr 2026 S2. This one: 5 Apr 2026 S2 See all 3 of this type

    3
    A mass of 1 kg kept on an inclined plane with 30∘30^{\circ} inclination with respect to horizontal plane and it is at rest initially. Then the whole assembly is moved up with constant velocity of 4 m/s4\text{ }m/s. The work done by the frictional force in time 2 s is ____\_\_\_\_ J. (Take g=10 m/s2g = 10\text{ }m/s^{2} )

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  6. Question 6

    This type asked 3 times: 26 Jul 2022, 1 Feb 2024, 8 Apr 2024. This one: 8 Apr 2024 See all 3 of this type

    17
    A player caught a cricket ball of mass 150 g150\text{ }g moving at a speed of 20 m/s20\text{ }m/s. If the catching process is completed in 0.1 s0.1\text{ }s, the magnitude of force exerted by the ball on the hand of the player is:

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  7. Question 7

    This type asked 3 times: 28 Jun 2022, 29 Jun 2022, 1 Feb 2024. This one: 1 Feb 2024 See all 3 of this type

    18
    Consider a block and trolley system as shown in figure. If the coefficient of kinetic friction between the trolley and the surface is 0.04, the acceleration of the system in ms−2ms^{- 2} is: (Consider that the string is massless and unstretchable and the pulley is also massless and frictionless):

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  8. Question 8

    This type asked 3 times: 29 Jun 2022, 28 Jul 2022, 11 Apr 2023. This one: 11 Apr 2023 See all 3 of this type

    19
    An average force of 125 N125\text{ }N is applied on a machine gun firing bullets each of mass 10 g10\text{ }g at the speed of 250 m/s250\text{ }m/s to keep it in position. The number of bullets fired per second by the machine gun is:

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  9. Question 9

    This type asked 3 times: 14 Jun 2022, 27 Jul 2022, 31 Jan 2023. This one: 31 Jan 2023 See all 3 of this type

    105
    A body of mass 10 kg10\text{ }kg is moving with an initial speed of 20 m/s20\text{ }m/s. The body stops after 5 s5\text{ }s due to friction between body and the floor. The value of the coefficient of friction is: (Take acceleration due to gravity g=10 ms−2g = 10{\text{ }ms}^{- 2} )

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  10. Question 10

    Asked 2 times: 25 Jan 2023*, 8 Apr 2026 S2 (* = numbers or wording changed that year) See all 2 times it was asked

    3
    A car moving with a speed of 54 km/h54\text{ }km/h takes a turn of radius 20 m . A simple pendulum is suspended from the ceiling of the car. Determine the angle made by the string of the pendulum with the vertical during the turning. (Take g=10 m/s2g = 10\text{ }m/s^{2} )

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