# Physics - Energy

> Source: https://ollybritton.com/notes/a-level/physics/topics/energy/ · Updated: 2024-08-25 · Tags: physics, school, year-1

##### What is energy??
The capacityof one object or system to do work or cause a change on another.

##### What is the principle of the conservation of energy??
The energy of a closed system always remains constant; energy can never be created or destroyed, only transferred.

##### What form of energy is due to the motion of a mass??
Kinetic energy.

##### What form of energy is due to the position of a mass in a gravitational field??
Gravitational potential energy.

##### What form of energy is due to the bonds between atoms in a substance??
Chemical energy.

##### What form of energy is due to a reversible change in shape of an object??
Elastic potential energy.

##### What form of energy is due to the forces between protons and neutrons in an atom??
Nuclear energy.

##### What form of energy is due to the electromagnetic waves??
Radiant energy.

##### What form of energy is due to the mechanical wave motion of atoms??
Sound energy.

##### What form of energy is due to randomly distributed potential and kintetic energies of atoms within a system??
Thermal energy.

##### What effect does friction have on the energy of a moving object??
Transfers kinetic energy primarily to thermal energy.

##### What does the difference between gravitational potential energy and the kinetic energy tell you??
The work done against resistive forces.

##### ![PHOTO TIDAL POWER](paste-ff6b77b5ac26bf2965ce8d400672041ba1644164.jpg) What height should you use when calculating the change in gravitational potential energy??
$$
5m
$$

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