IB Physics Glossary



Browse the glossary using this index

Special | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | ALL

Page: (Previous)   1  ...  3  4  5  6  7  8  9  10  11  12  ...  23  (Next)
  ALL

F

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).

G

g versus E




GravitationalElectric
ForceF = G \frac{m_1 m_2}{r^2}F = k \frac{q_1 q_2}{r^2}
Constant

G k
Field strength
g = \frac{F}{m} = G \frac{M}{r^2}

F = m g
E = \frac{F}{q} = G \frac{Q}{r^2}

F = q E
Other detailsForce is always attractiveForce can be attractive (for like charges) or repulsive (for opposite charges)
Acts on particles

with mass

with electric charge

Galactic cluster

is a collection of galaxies grouped together due to the gravitational attraction between them. (d)

Galactic supercluster

is a group of galactic clusters. (d)

Galaxy

is a large group of stars gravitationally bound together (approx. 1010 stars, diameter 105 ly). (d)

Page: (Previous)   1  ...  3  4  5  6  7  8  9  10  11  12  ...  23  (Next)
  ALL