Work Energy Theorem

Fictitious force is also known as _____.

The work done by a pseudo force is _____.

A variable force acts on body of mass $1 \mathrm{kg}$ and it changes the velocity of the body from $2 \mathrm{m}/\mathrm{s}$ to $6 \mathrm{m}/\mathrm{s}$. Find the work done (in $\mathrm{joule}$) on the body by the variable force.

An object of $40 \mathrm{kg}$ mass is moving with $5 \raisebox{1ex}{$\mathrm{m}$}\!\left/ \!\raisebox{-1ex}{$\mathrm{s}$}\right.$ velocity. Now force is applied on the object such that its velocity increases to $10 \raisebox{1ex}{$\mathrm{m}$}\!\left/ \!\raisebox{-1ex}{$\mathrm{s}$}\right.$. Calculate the work done by the force in joules.

A bullet of mass $m$ fired at $30°$ to the horizontal leaves the barrel of the gun with a velocity $v$. Then bullet hits a soft target at a height $h$ above the ground. While it is moving downward it hits the target and emerges out with half the kinetic energy it had before hitting the target. Which of the following statements is correct with respect to the bullet after it emerges out of the target?

A raindrop of mass $1 \mathrm{g}$ falling from a height of $1 \mathrm{km}$ hits the ground with a speed of $50\mathrm{ }\mathrm{m} {\mathrm{s}}^{-1}$. If the resistive force is proportional to the speed of the drop, then the work done by the resistive force is
$(\text{Take} g=10\mathrm{ }\mathrm{m} {\mathrm{s}}^{-2})$

A certain force acting on a $20 \mathrm{kg}$ mass changes its velocity from  $5 {\mathrm{ms}}^{-1}$ to $2 {\mathrm{ms}}^{-1}$. Calculate the work done by the force.

A charge of $2 \mathrm{C}$ moves between two plates, maintained at a potential difference of $1 \mathrm{V}.$ What is the energy acquired by the charge?

A ball is dropped from a height of $20\mathrm{ }\mathrm{c}\mathrm{m}$. Ball rebound to a height of $10\mathrm{ }\mathrm{c}\mathrm{m}$. What is the loss of energy?

According to work-energy theorem, the work done by the net force on a particle is equal to the change in its