9 of the Physics glossary’s terms, each with the part of the syllabus where you first meet it.
The continuous record of atmospheric carbon dioxide concentration measured at Mauna Loa Observatory, Hawaii, since 1958.
The form of the second law stating that no heat engine working in a cycle can take thermal energy from a single reservoir and convert it completely into work.
Each planet moves in an ellipse with the Sun at one focus.
The line joining a planet to the Sun sweeps out equal areas in equal intervals of time, so the planet moves fastest when closest to the Sun.
For bodies orbiting the same central mass, the square of the orbital period is proportional to the cube of the semi-major axis (the radius for a circular orbit):
A unit of energy: the energy transferred at a power of 1 kW for one hour, equal to .
The description of motion in terms of position, velocity and acceleration, without considering its causes.
The energy a body has because of its motion: .
The model of a gas as a very large number of tiny molecules in random motion, colliding elastically, with no forces between them except in collisions.