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 force $\vec{F} = (3\hat{i} + 4\hat{j})$ N acts on a particle displacing it by $\vec{s} = (2\hat{i} - 5\hat{j})$ m. The work done by the force is:

A particle moves along the x-axis under the influence of a force $F(x) = -kx^2$. If the particle moves from $x = a$ to $x = 2a$, the work done by the force is:

A block of mass $m$ is placed on a smooth horizontal surface. A constant force $F$ is applied at an angle $heta$ above the horizontal. If the block covers a distance $d$, the work done by the force $F$ is:

Two blocks of masses $m_1$ and $m_2$ are connected by a light inextensible string passing over a smooth pulley. The work done by the tension on $m_1$ as it moves a distance $h$ upwards is:

A force $\vec{F} = (2x + 3)\hat{i}$ N acts on a particle as it moves from $x = 0$ to $x = 2$ m. The work done by the force 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?