List of top Physics Questions on laws of motion

A body of mass \(M\) is suspended from the lower end of an aeroplane accelerating horizontally. If the rope can withstand a maximum tension \(T\), then the maximum acceleration of the aeroplane is:

A body is placed at the top of an inclined plane of angle of inclination \( \tan^{-1}\left(\frac{9}{16}\right) \). If the plane is smooth, the body reaches the bottom in time \(T\) and if the plane is rough, it takes time \(3T\) to reach the bottom of the plane, then the coefficient of kinetic friction between the body and the rough inclined plane is:

A block of mass 2 kg is kept on a horizontal surface and is pulled with a horizontal force F. If the surface is smooth, the acceleration is $8\ \text{m s}^{-2}$. If the surface is rough with coefficient 0.25, acceleration is: (g = $10\ \text{m s}^{-2}$)}

Two blocks of masses 4.5 kg and 5.5 kg are connected to the two ends of a light inextensible string passing over a frictionless pulley fixed to a rigid support. At time $t=0$, the blocks are released from rest. The distance travelled by the larger block in a time $t=4$ s is (Acceleration due to gravity $=10\,ms^{-2}$)

A block of mass 5 kg is sliding with constant velocity of \( 6 \, ms^{-1} \) on a frictionless horizontal surface. The force exerted on the horizontal surface is:

On a wedge of mass 2m, a block of mass m is sliding as shown in the figure. There is no friction between block and wedge. Then the minimum coefficient of friction between wedge and ground so that the wedge does not move is:

A block is kept at the top of a rough inclined plane of length $2.8\text{ m}$ and angle of inclination $\cos^{-1}(0.6)$. If the coefficient of kinetic friction between the block and the upper half of the plane is $0.3$ and between the block and the lower half of the plane is $0.5$, then the velocity with which the block reaches the bottom of the plane is (acceleration due to gravity $=10\text{ ms}^{-2}$)

A lift of mass $M$ is accelerating upwards with an acceleration $a$. If the tension in the supporting cable is $T_1$ during upward acceleration and $T_2$ when it accelerates downwards with the same acceleration $a$, then the ratio $T_1 / T_2$ is:

A lift of mass $M$ is accelerating upwards with an acceleration $a$. If the tension in the supporting cable is $T_1$ during upward acceleration and $T_2$ when it accelerates downwards with the same acceleration $a$, then the ratio $T_1 / T_2$ is:

A force of \( 20 \text{ N} \) is applied to a \( 5 \text{ kg} \) object at an angle of \( 60^{\circ} \) to the horizontal. What is the horizontal acceleration of the object, ignoring friction?

A man of mass \(60 \text{ kg}\) is standing in a lift moving up with a retardation of \(2.8 \text{ ms}^{-2}\). The apparent weight of the man is

FALSE statement about third law of motion is

A hanging rope can withstand a tension of 750 N. The minimum acceleration for a man of 50 kg to climb up without breaking the rope is $(g=10\text{ ms}^{-2})$

When two perpendicular forces 3 N and 4 N act on a body at rest, it is accelerated to \(2 \, ms^{-2}\). The mass of the body is.

If a gun fires 25 bullets in one second, each of $10g$ mass with a velocity of $20\,ms^{-1}$, then the recoil force on the gun in $N$ is:

Force acting on a particle varies with time \( t \) as \( F = kt \), where \( k \) is a constant. The velocity of the particle after a time \( t \) is

An object of mass m is placed in a lift moving upward with acceleration g/2. Find apparant weight.

A block of mass \(5\ \text{kg}\) is on a frictionless surface; find its acceleration when a force of \(10\ \text{N}\) is applied.

Find the coefficient of friction if the time taken by a block on the rough surface is \(50\%\) more than the time taken on a smooth surface. The distance slid by the mass is the same in both cases. The incline angle is \(45^\circ\).

The Velocity Ratio (VR) of a block and tackle system of two pulleys with the effort in the upward direction is:

For a body to be in dynamic equilibrium, its:

A block of mass $\sqrt{2}$ kg is placed on a rough horizontal surface. A force 'F' acting upwards at an angle of 45$^\circ$ with the horizontal causes the block to start motion. If the coefficient of static friction between the surface and the block is 0.25, the magnitude of the force 'F' is (Acceleration due to gravity = 10 ms$^{-2}$)