Laws of Motion NEET PYQs (1996–2026)

Solved Laws of Motion PYQs

3 recent questions with answers. The full set of 67 is free to practise.

1. NEET 2025HardFriction
   Q1

   There are two inclined surfaces of equal length $(L)$ and same angle of inclination $45^{\circ }$ 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 surface than on the smooth surface. The coefficient of kinetic friction $\left({\mu }_k\right)$ between the object and the rough surface is close to
   
   NEET 2025

   • A0.5
   • B0.75
   • C0.25
   • D0.40

   Show answer & solution

   Correct answer: (B)

   The time taken to slide down the rough surface is twice that of the smooth surface: $t_{\text{rough }}=2t_{\text{smooth }}$.
   The acceleration on the smooth surface is given by:
   
   $$a_{\text{smooth }}=gsin\theta$$
   
   The time to slide down an inclined plane is inversely proportional to the square root of the acceleration:
   
   $$t\propto \frac{1}{\sqrt{a}}\Rightarrow t_{\text{smooth }}\propto \frac{1}{\sqrt{gsin\theta }}$$
   
   The acceleration on the rough surface is:
   
   $$a_{\text{rough }}=gsin\theta -{\mu }_{k}gcos\theta$$
   
   Relating the times on both surfaces, we have:
   
   $$\frac{t_{\text{rough }}}{t_{\text{smooth }}}=\frac{\sqrt{sin\theta }}{\sqrt{sin\theta -{\mu }_{k}cos\theta }}=2$$
   
   Squaring both sides results in:
   
   $$\frac{sin\theta }{sin\theta -{\mu }_{k}cos\theta }=4$$
   
   Substituting $\theta =45^{\circ }$ where $sin\theta =cos\theta =\frac{1}{\sqrt{2}}$, we find:
   
   $$\frac{\frac{1}{\sqrt{2}}}{\frac{1}{\sqrt{2}}-{\mu }_k\times \frac{1}{\sqrt{2}}}=4$$
   
   Simplifying further:
   
   $$1-{\mu }_k=\frac{1}{4}$$
   
   Solving for ${\mu }_k$ :
   
   $${\mu }_k=\frac{3}{4}=0.75$$
   
   Thus, the coefficient of kinetic friction is 0.75 .
2. NEET 2024MediumFree Body Diagrams & Equilibrium of Forces
   Q2

   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 block $A$ on block $B$ is :
   [NEET 2024]

   • AZero
   • B4N
   • C6N
   • D10N

   Show answer & solution

   Correct answer: (C)

   $$F=\left(M_1+M_2\right)aa=\frac{10}{2+3}=2{ms}^{-2}{F}^{\prime }=M_2(2)=3\times 2N=6N$$
3. NEET 2023EasyImpulse & Conservation of Linear Momentum
   Q3

   A 1 kg object strikes a wall with velocity $1ms{}^{-1}$ at an angle of 60 . with the wall and reflects at the same angle. If it remains in contact with wall for 0.1 s , then the force exerted on the wall is :-
   [NEET 2023 mpr]

   • A30、3N
   • BZero
   • C$10\sqrt{}3N$
   • D20V3N

   Show answer & solution

   Correct answer: (C)

   $$F=\left|\frac{\Delta \overrightarrow{p}}{\Delta t}\right|=\frac{2mvsin\theta }{t}=\frac{2(1)(1)sin60^{\circ }}{0.1}=10\sqrt{3}N$$

Topic-wise question count

Where NEET has asked from Laws of Motion, most frequent first.

• Impulse & Conservation of Linear Momentum19
• Friction15
• Newton’s Laws of Motion13
• Free Body Diagrams & Equilibrium of Forces11
• Circular Motion Dynamics8
• Newton's Laws of Motion1

Year-wise Laws of Motion questions in NEET

Number of questions from this chapter in each year's paper(s).