energy✩ Flashcards
what are the forms of energy
mechanical sound heat electrical electromagnetic nuclear
what are the two types of mechanical energy
potential and kinetic
what is sound energy
energy due to the vibration/ disturbance of matter
what is heat/ thermal energy
energy of moving atoms and molecules
what is electrical energy
energy due to the flow of electric charge through a conductor
what is electromagnetic energy
energy that comes from electromagnetic radiation
what is nuclear energy
energy from the nucleus of atoms
what is energy
the ability to do work
or
the ability to cause change
what is the SI unit of energy
joules, J
what does the law of conservation of energy state
the law of conservation of energy states that energy can neither be created or destroyed but can be change from one form to another
what is potential energy
Potential Energy is energy of an object due to its position (or state), structure or composition.
what are the types of potential energy
elastic
chemical
gravitational
what is elastic potential energy
the amount of energy stored in a stretched or compressed elastic object.
E.g. A wound up clock spring or a stretched spring.
what is chemical potential energy
energy stored in the molecules of chemical compounds
E.g. in the bonds of gasoline molecules, food
what is gravitational potential energy
gravitational potential energy is the energy stored in an object as the result of its vertical position
how to calculate gravitational potential energy
Ep=mgh
how to calculate kinetic energy
Ek= 1/2mv^2
what is power
Power, P is the rate at which work is done. That is, Work done per second
OR
Power is the rate at which energy is transformed from one form to another.
what is efficiency
efficiency is defined as the ratio of energy (work) output value to energy (work) input value
what is the SI unit for power
joules/second
j/s
or
watts,w
