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Free-body force diagram
A diagram of an object showing only the forces acting on the object.
The number of cycles of a wave that pass a point per second.
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.
High-energy photons emitted by unstable nuclei.
Gravitational field strength
Force of gravity per unit mass on a small object.
Lowest energy state of an atom.
Particles and antiparticles thac can interact through the strong interaction.
The extension of a spring is proportional to the force needed to extend it.
Resistance of an object to change of its motion.
Formation of points of cancellation and reinforcement where two coherent waves pass through each other.
Resistance inside a source of electrical energy; the lossof pd per unit current in the source when current passes through it.
A charged atom.
Process of creating ions.
Isotopes of an element
Atoms of an element with different number of neutrons and the same number of protons.