Physics

• Work done (J) = force (N) x distance (m)
• Power = Work done (J) / Time (s)
• Energy can be transferred from one form to another, but cannot be created or destroyed.
• Energy is the ability to do work
• Potential energy is stored energy that can be converted into kinetic energy or other forms of energy.
• Kinetic energy is the energy an object has due to its motion.
• Gravitational Potential Energy = mass x gravitational field strength x height
• Gravitational field strength = 10 N/kg (or 9.81 N/kg)
• Elastic potential energy = force x extension / 2
• Spring constant = force / extension
• Kinetic energy = 0.5 x mass x speed^2
• Force = Elastic constant x Extention
• Elastic potential energy = 0.5 x spring constant x extension^2
• percentage efficiency = useful energy output / total energy input x 100
• Change in thermal energy = mass x specific heat capacity x change in temperature
• Heat is always produced with electrical appliances
• Energy for the change of state = mass x specific latent heat