What is work?

Work in physics is the transfer of energy; work is done on an object when an applied force moves it through a distance. The link between work and energy is work done equals energy transferred. The units for the two are also the same (joules). E.g. 500J of work = 500J of kinetic energy.

Work is calculated with the formula: work done=force x distance moved

For example, if a force of 10 newton (F = 10 N) acts along point that travels 2 meters (d = 2 m), then it does the work W = (10 N)(2 m) = 20 N m = 20 J. This is approximately the work done lifting a 1 kg weight from ground to over a person's head against the force of gravity. Notice that the work is doubled either by lifting twice the weight the same distance or by lifting the same weight twice the distance.

Examples:

Force is measured in newton’s (N)

Distance is measured in meters (M)

Work done is measured in joules (J)

Examples of work done:

How much work is done by a person who uses a force of 27.5N to move a grocery buggy 12.3m?

W = F x d = (27.5N) (12.3m) = ?

Equation

W = 338.25J

Answer

55, 000J of work is done to move a rock 25m. How much force was applied?

F = W = 55,000J = ? d 25m

Equation

F = 2200J

Answer

You and 3 friends apply a combined force of 489.5N to push a piano. The amount of work done is 1762.2J. What distance did the piano move?

Equation

d= W = 1762.2J = F 489.5N

Answer

d = 3.6m

What is kinetic energy?

Kinetic energy is energy of motion. The kinetic energy of an object is the energy it possesses because of its motion. The kinetic energy of a point mass m is given by

All moving things have kinetic energy. It is energy possessed by an object due to its motion or movement. These include very large things, like planets, and very small ones, like atoms. The heavier a thing is and the faster it moves the more kinetic energy it has.

The amount of kinetic