IB Physics Glossary



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F

Far point

is the most distant point from the eye for which the eye can focus on (assumed to be \infty).

Faraday's law

states, the induced emf is proportional to the rate of change of magnetic flux linkage:

\epsilon \propto \frac{\Delta \Phi}{\Delta t}.

First law of thermodynamics

states, Q = \Delta U + W.
Where
Q is the heat supplied to system, \Delta U is the change in the internal energy, W is the work done by gas, all in Joules. It is the law of conservation of energy.

Note
a. Q > 0, heat in; Q < 0, heat out

b. \Delta U > 0, \Delta T > 0; \Delta U < 0, \Delta T < 0

c. W > 0
, work done by gas; W < 0, work done on gas.

Force field

is a region of space where masses/charges feel a force.

Forced oscillations

occur when an object is forced to oscillate by a periodic external force. (d)

Fuel enrichment

Enrichment is the process by which the isotopic composition of a nuclear fuel is increased to make nuclear fissions more likely. Typically, uranium fuel rods are enriched, via neutron bombardment, to ensure that the percentage content of uranium-235 is increased.

Fundamental units

are the most basic units which cannot be expressed in terms of other units. The seven fundamental units are
1. meter (m);
2. second (s);
3. kilogram (kg);
4. Kelvin (K);
5. The Ampere (A);
6. mole (mol);
7. candela (cd).