Laws of Motion MCQs for NEET — Physics Questions with Answers

A spring having length l and spring constant k is divided into two parts having lengths $l_1$ and $l_2$. If $l_1 = nl_2$, the force constant of the spring having length $l_2$ is

Mechanics and newton’s motion laws as ............... laws depended.

If the resulting external force acting on system is zero then.... of the system is constant and if the resultant external torque acting on a system is zero then....... of the system is constart.

A block of mass 10 kg is suspended by three strings as shown in the figure. The tension T, is

The momentum is given by p=4t+1, the force at t=2s is

If the momentum of a particle is given by P=(180-8t) kg m/s, then its force will be

A force $\overrightarrow{\mathrm{F}}=6\hat{\mathrm{i}}-8\hat{\mathrm{j}}+10\hat{\mathrm{k}}$ Newton produces acceleration $1 \mathrm{m}/{\mathrm{s}}^2$ in a body. The mass of the body is (in kg)

Six forces, 9.81 N each, acting at a point are coplanar. If the angle between neighboring forces are equal, then the resultant is

A motor boat of mass m moving along a lake with velocity ${\mathrm{V}}_0$. At t=0, the engine of the boat is shut down. Magnitude of resistance force offered to the boat is equal to rV. (V is instantaneous speed). What is the total distance covered till it stops completely? $\left[\mathrm{Hint}: \mathrm{F}\left(\mathrm{x}\right)=\mathrm{mV}\frac{\mathrm{dV}}{\mathrm{dx}}=-\mathrm{rV}\right]$

A particle is thrown upwards from ground. It experiences a constant resistance force which can produce retardation of 2 $m/s^2$. The ratio of time of ascent to the time of descent is: $[g=10 m/s^2]$