Energy & Work

Work done = F × d, where F is the force applied and d is the distance moved in the direction of the force.

The S.I. unit of work is Joule.

Potential energy (P.E.) = mgh, where m is mass, g is acceleration due to gravity, and h is height.

Energy also has the same unit as work, which is Joule.

Energy is a scalar quantity.

Work done on an object results in a change in energy of that object.

Kinetic energy (KE) is the energy of an object due to its motion, given by the formula KE = $$\frac{1}{2}mv^2$$ .

Power = $$\frac{Work}{Time}$$ .

The unit of power is Watt (W), which is equivalent to one Joule per second.

The principle of conservation of energy states that energy cannot be created or destroyed, only transformed from one form to another.