Definitions of Energy - Motion energy is properly called kinetic energy; it is proportional to the mass of the moving object andgrows with the square of its speed.

A $75.0 \mathrm{kg}$ man pushes on a $5.0\times 10 \mathrm{ton}$wall for $250 \mathrm{s}$ but it does not move. How much work does he do on the wall? ($2000 \mathrm{lb}=1 \mathrm{ton}$ and $0.454 \mathrm{kg}=1 \mathrm{lb}$)

A body of mass $5 \mathrm{kg}$ is placed at the origin, and can move only on the x-axis. A force of $10 \mathrm{N}$ is acting on it in a direction making an angle of $60°$ with the axis and displaces it along the x-axis by $4 \mathrm{metres}$. The work done by the force is

A boy throws a ball in upward direction that reaches a height of 10 m. If the mass of the ball is 980 gm, find the work done by the force of gravity.

A block is pushed through $2 \mathrm{m}$ across a surface offering $25 \mathrm{N}$ resistance. The work done by resistance force is 

A body of mass $30 \mathrm{kg}$ is displaced horizontally in a curved path. The body later comes back to that position from where it was displaced. Check whether work is done or not.

A block is pushed through $2 \mathrm{m}$ across a surface offering $25 \mathrm{N}$ resistance. The work done by resisting force is

Why it is easier to roll a stone up a sloping road than to lift it vertical upwards?

A machine which has an efficiency of $80\%$ raises a load of $50 \mathrm{N}$ through a vertical height of $10 \mathrm{m}$. The work input to the machine is

An engine can pump $30,000 \mathrm{lit}.$ of water to a vertical height of $45 \mathrm{m}$ in $10 \min$. Calculate the work done by the machine and its power?

A force of $10 \mathrm{N}$ is applied on $20 \mathrm{kg}$ mass at rest. The work done in the fourth second is

A force of $10 \mathrm{N}$ is applied on an object of mass $1 \mathrm{kg}$ for $2 \mathrm{s}$, which was initially at rest. What is the work done on the object by the force?

A force $F$ acts on a body of mass $m$ initially at rest producing uniform acceleration $a$ for a time interval $t$. The work done on the body is :-

Spring constant of a spring is $K = 6 \times {10}^3 \mathrm{N}/\mathrm{m}$. Work done to stretch it ${10}^{-2} \mathrm{m}$from mean position is

Heat and work done by the heat was discovered by

A force of $40 \mathrm{N}$ acts on a body, and body moves through a distance of $2$ metre at an angle of $45°$ in the direction of the force. The work done by the force is 

What do you mean by work done? Describe the relationship between work and energy.

What you mean by work done? State the factors affecting work done. What you mean by positive, negative and zero work?

Can work done be positive, negative and zero? Explain.

What is work done? What are the factors affecting work done? Also explain about positive, negative and zero work done.

Explain the different conditions for work done such as the minimum, maximum and zero work done.