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Free-body force diagram
A diagram of an object showing only the forces acting on the object.
Frequency
The number of cycles of a wave that pass a point per second.
Friction
Force opposing the motion of a surface that moves or tries to move across another surface.
Fundamental mode of vibration
Pattern of stationary waves on a string when it vibrates at its fundamental (i.e. lowest possible) frequency.
Gamma radiation
High-energy photons emitted by unstable nuclei.
Gravitational field strength
Force of gravity per unit mass on a small object.
Ground state
Lowest energy state of an atom.
Hadron
Particles and antiparticles thac can interact through the strong interaction.
Hooke's law
The extension of a spring is proportional to the force needed to extend it.
Inertia
Resistance of an object to change of its motion.
Interference
Formation of points of cancellation and reinforcement where two coherent waves pass through each other.
Internal resistance
Resistance inside a source of electrical energy; the lossof pd per unit current in the source when current passes through it.
Ion
A charged atom.
Ionisation
Process of creating ions.
Isotopes of an element
Atoms of an element with different number of neutrons and the same number of protons.