Laws of Motion
8 NEET Physics previous year questions on Laws of Motion — options free on every question; 1 include the answer & explanation free, the rest unlock with PYQ Pass.
A box of mass \(5\mathrm{kg}\) is pulled by a cord, up along a frictionless plane inclined at \(30^\circ\) with the horizontal. The tension in the cord is \(30\mathrm{N}\). The acceleration of the box is (Take\(\mathrm{g}=10{\mathrm{ms}}^{-2}\) ):
\(1\mathrm{m}{\mathrm{s}}^{-2}\)
\(\begin{matrix}\text{Force acting up the incline (Tension, }T\text{):} & \\ T & =30\text{ N} \\ \text{Force acting down the incline:} & \\ mg\sin \theta & =5\times 10\times \sin ({30}^{∘}) \\ & =50\times \frac{1}{2}=25\text{ N} \\ \text{Net force equation (}{F}_{\text{net}}=ma\text{):} & \\ T−mg\sin \theta & =ma \\ 30−25 & =5\times a \\ 5 & =5a \\ a & =1\text{ m }{\text{s}}^{−2}\end{matrix}\)
The kinetic energies of two similar cars A and B are \(100\mathrm{J}\) and \(225\mathrm{J}\) respectively. On applying breaks, car A stops after 1000 m and car B stops after 1500 m. If \({\mathrm{F}}_{\mathrm{A}}\) and \({\mathrm{F}}_{\mathrm{B}}\) are the forces applied by the breaks on cars A and B respectively, then the ratio \({\mathrm{F}}_{\mathrm{A}}/{\mathrm{F}}_{\mathrm{B}}\) is
[NEET 2025]
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A block of mass \(5 kg\) is placed at rest on a table of rough surface. Now, if a force of \(30 N\) is applied in the direction parallel to surface of the table, the block slides through a distance of \(50 m\) in an interval of time \(10 s\). Coefficient of kinetic friction is (given, \(g=10 ms ^{-2}\) ):
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A ball of mass \(0.15\ kg\) is dropped from a height \(10\ m\), strikes the ground and rebounds to the same height. The magnitude of impulse imparted to the ball is (\(g = 10\ m/s^{2}\)) nearly:
[NEET 2021]
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A small block slides down on a smooth inclined plane, starting from rest at time \( t=0 \). Let \( S_{n} \) be the distance travelled by the block in the interval \( t=n-1 \) to \( t=n \). Then, the ratio \( \frac{S_{n}}{S_{n+1}} \) is
[NEET 2021]
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A bullet is fired from a gun. The force on the bullet is given by \( F=600-2 \times 10^{5} t \) where, \( F \) is in newton and \( t \) in seconds. The force on the bullet becomes zero as soon as it leaves the barrel. What is the average impulse imparted to the bullet?
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The time taken by an object to slide down a \(45^{\circ}\) rough inclined plane is \(n\) times as it takes to slide down a perfectly smooth \(45^{\circ}\) inclined plane. The coefficient of kinetic friction between the object and the incline plane is
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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
\(\text{ ( }\mathrm{g}=10\mathrm{m}{\mathrm{s}}^{-2}\text{ ). }\)
[NEET 2023]
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