Work done is the energy transferred by a force. Work is done when energy is transferred from one object to another.The amount of work that is done means the amount of energy transferred.Work done = force×distance travelled in the direction of the force.Work is measured in joules.ΔW = FΔsLifting a mass of 2kg a height h of 5m requires a force equal to mg, the weight of the object.ΔW = FΔs soΔW = mgΔh = 2 × 9.81 × 5 = 98.1 JThe work done gets transferred to gravitational potential energy.Work done by forces at an angle can be calculated from the component of the force that is in the same direction as the object travels.
In the above diagram the work done is Tcosθ ×s where s is the distance travelled in the horizontal direction.The object is in equilibrium in the vertical direction, so Tsinθ + the normal contact force = the weight.
In the above diagram the work done is Tcosθ ×s where s is the distance travelled in the horizontal direction.The object is in equilibrium in the vertical direction, so Tsinθ + the normal contact force = the weight.