Energy work and power

Energy

• Energy is defined as the capacity to do work

• Kinetic energy is the energy of a body due to its motion.

• Potential energy is the stored energy in a system.

• Chemical potential energy is the energy stored in a substance due to the position of the atoms or electrons in the substance.

• Elastic potential energy is the energy stored in a body due to elastic deformation.

• Gravitational potential energy is the energy stored in an object due to its height above the ground.

• Electrical energy is the energy of an electric charge due to its position and motion.

• Light is an electromagnetic wave visible to the eye. Made up of electric and magnetic fields oscillating at a certain range of frequency within the electromagnetic spectrum.

• Thermal energy is the energy stored in a body due to its temperature.

• Nuclear energy is the energy released during a nuclear reaction.

• NICEKG

Principle of conservation of energy

• Energy cannot be created nor destroyed

• Energy can be converted from one form to another

• Total energy in an isolated system is constant

Efficiency

(useful output/total input) x 100

work done

• Work done by a constant force on an object is the product of the force and the distance moved by the objects in the direction of the force

• Wd = fd

kinetic energy

KE = 1/2mv²

Gravitational potential energy

GPE = mgh

power

p = wd/t = e/t