NEET Physics Work, Energy, and Power MCQs

A block of mass 2 kg is pulled up a rough inclined plane of inclination $30^\circ$ with a constant force $F$ parallel to the incline. The coefficient of kinetic friction between the block and the plane is 0.2. If the block moves with a constant speed of 2 m/s, the power delivered by the force $F$ is:

A block of mass 'm' slides down a frictionless curved track from a height 'h'. It then collides elastically with a stationary block of mass '2m'. After the collision, the smaller block momentarily comes to rest. What is the maximum height the larger block will reach?

A particle is subjected to a conservative force whose potential energy is given by $U(x) = ax^2 - bx^3$, where 'a' and 'b' are positive constants. At what value of 'x' is the particle in stable equilibrium?

A small ball attached to a massless string is undergoing vertical circular motion. At the highest point of its trajectory, the tension in the string is zero. Which of the following statements is TRUE about the ball's mechanical energy as it moves from the highest point to the lowest point in the circle?

A solid sphere rolls without slipping down an inclined plane of angle $heta$. What fraction of its total kinetic energy is rotational?

A spring of force constant 'k' is compressed by a distance 'x' and used to launch a block of mass 'm' up a frictionless incline of angle $heta$. What is the maximum distance 'd' the block travels along the incline before momentarily coming to rest?

A block of mass m is released from rest at the top of a smooth curved track of height h. It then enters a rough horizontal section with a coefficient of kinetic friction μ. What is the distance the block travels on the rough section before coming to rest?

A particle of mass $m$ moving with velocity $v$ collides elastically with another particle of mass $2m$ at rest. If the lighter particle is deflected through an angle of $90^\circ$, the fractional loss in its kinetic energy is:

Two identical balls A and B are moving with velocities $v$ and $2v$ respectively, having the same kinetic energy. The ratio of their masses is:

A body of mass $m$ is moving in a circular path of radius $r$ with a constant speed $v$. The work done by the centripetal force in half a revolution is: