Laws Of Motion - Mechanics - Physics Previous Year Questions

Which of the following laws of Physics is valid across all domains of nature?

A body under the action of a force \(F = 6\widehat i - 8\widehat j + 10\widehat k\), acquires an acceleration of 1 m/s². The mass of this body must be

The motion of a particle of mass \(m\) is described by \(y = ut + g{t^2}\). The force acting on the particle will be

With what minimum acceleration can a fireman slide down a rope while breaking strength of the rope is \(\frac{2}{3}\) of the weight?

If the resultant of all external forces acting on a system of particles is zero, then from an inertial frame one can surely say that

\(\mathrm{F}_{\mathrm{A}}, \mathrm{F}_{\mathrm{B}}\) and \(\mathrm{F}_{\mathrm{C}}\) are three forces acting at point \(\mathrm{P}\) as shown in figure. The whole system is in equilibrium state. The magnitude of \(\mathrm{F}_{\mathrm{A}}\) is

A hockey player hits the ball at an angle of \(37^{\circ}\) from the horizontal with an initial speed of \(40 \mathrm{~m} / \mathrm{s}\) (a right angled triangle with one of the angle is \(37^{\circ}\) and their sides in the ratio of \(6: 8: 10\)). Assume that the ball is in a vertical plane. The time at which the ball reaches the highest point of its path is

A man standing in a truck moving with constant velocity throws a ball vertically into air, ball falls

A cube bar slides thrice the time with friction than that without friction when it slides on an inclined plane of inclination \(45^{\circ}\). The coefficient of friction between the block and the surface is

A body initially at rest undergoes rectilinear motion. The forcetime (F-t) graph for the motion of the body is given below. Find the linear momentum gained by the body in \(2 \mathrm{~s}\).

Action and reaction can never balance out because

A stone of mass \(2 \mathrm{~kg}\) is hung from the ceiling of the room using two strings. If the strings make an angle \(60^{\circ}\) and \(30^{\circ}\) respectively with the horizontal surface of the roof then the tension on the longer string is : \(g=10 \mathrm{~ms}^{-2}\)

A machine gun fires a bullet of mass m with a velocity of $1000 \mathrm{~m} / \mathrm{min}$. The man holding the gun can exert a force of 200 N on the gun. The product of mass of each bullet and the number of bullets fired in one sec is

A block of metal, of 25 g mass moves down without acceleration when the plane is inclined at an angle of $30^{\circ}$. When the inclination is increased by $30^{\circ}$, find the downward acceleration of the block.